Lenovo Legion Y740 17" 15"

I repasted my unit with Gelid Extreme and repaded it with Gelid GP-Extreme 1mm pads (90x50x1).

Some original pads were thicker, around 2mm but I used 1mm anyway and they are touching the necessary components. If they do not shrink from temperature and time then it should be ok.


Night and day difference for me after using Y740 for 1 year on stock paste and pads.

 

Good day Jacol,

thank you for your feedback!

Just one question: The heatsink design is very unequally high, the 1mm pads are super thin in comparison to the original ones.
I bought gelid extreme pads as well. One day i will swap the pads as well but when i tried it last year i was sure some mosfets are not touching the heatsink especially the PCH.
There was a bigh gap with the 1mm gelid pads applied between the pad and the heatsink.
How have you checked it and what is your VCC temp sensor saying when you stress your system?
(In Hwmonitor the VCC temps are just appearing when you stress your system) seconds after i stop the stress test the VCC temp goes from 50-60°C to 10°C and disappears.

On which BIOS version are you btw, people have serious issues with the latest BIOS removing the UV possibility totally.
9th and 10th gen CPU is affected of this fix.

 

@Itzap

I fitted the heatsink before screwing it on to see if the pads touch the elements - seemed ok.
Before my PCH was doing 90C, now it does around 70C while gaming with Y740 on my lap as always.

Below is the screen from Intel burn test with Warzone in the background.
Lenovo profile set to performance. Seems VRMs are doing better than good if the sensor is right.





Second screen, profile set to balanced in Vantage and playing WZ for +40mins:

 

@Jacol

Thank you for the screenshots, appreciate it.

Your temps are outstanding, the gelid pads and thermal compound was a good invest.
I have the gelid extreme compound as well as the phobya nanogreas extreme here i think both are on the same level but the gelid was hard to apply it's like peanut butter.

 

Hello guys
This package will replace default RGB rainbow keyboard effect for solid blue color - so if you got enough of RGB puke you can give it a try.
Be aware - once you flash it there will be no way to restore default RGB effect.

Keyboard FW

 

Have anyone having problem with undervolt being locked after lasted Bios?

I have done a factory reset to my Y740 (i7-8750H) and now I can't undervolt the CPU.

 

ThrottleStop does not work anymore with latest bios?

 

Nope, Intel XTU and ThrottleStop isn't working!

It looks like we can't rollback the Bios wihout briking the Bios...

 

Looks like we gonna have to repaste/repad.

Gonna look at ordering now

Would you recommend I find 2mm pads then?

 

Hello @Muzava

could you please provide us more informations?
- Which BIOS version is on your Y740 at the moment?
- How do you check if XTU or TS UV does not work? Can you confirm it with HWinfo64 or something else?

I have the Y740-15icHg with 8750h and running the latest BIOS AVCN22WWV1.12. UV works perfect.

In my last posts i wrote that indeed many laptop users with Core/Coffe or Core/Comet lake CPUs having issues after BIOS updates where vulnaribilities have been closed and within that UV has been disabled for many users.
But users here in the forum with 9th gen have confirmed that they are not affected from this UV fix.
And the 8th gen CPUs shouldn't be affected at all.

At least, boot from an external drive or USB pendrive with a Win10 on it and try under this scenario if UV is still not working.

Last boot into the debug BIOS and do a full debug reset of your BIOS and try it again.

 

Hi,

Just to state this only happen after Factory Reset.

Bios version is 1.12 (AVCN22WWV1.12) for the Legion Y740-15ICHg (i7-8750H).
Yes, I did chect with HWINFO and Intel XTU and ThrottleStop. Intel XTU clock offset voltage is grey (locked) and in ThrottleStop says it's locked.

https://ibb.co/rHJcwbc - Intel XTU 6.5.40
https://ibb.co/9vZ0jM4 - ThrottleStop 9.3

I have tested older version of the ThrottleStop and It's the same.

Far I know, 6th gen to 9th gen are affect with microcodes update.

I will try to boot from a external drive, just to check if it's something with Windows. - It doesn't let me select any external devices. I have at least 3 hdd with windows 10 and 2 usb external cases.

Also, How do you do a full debug reset? I know how to enter in debug bios, but i never did a full debug reset.

 

Hello Muzava,

i try my best to help you as much as possible as i was also shocked seeing the first youtube videos about this undervolt removal nightmare and also the first forum and reddit posts because i always update to the latest BIOS form lenovo and i haven't checked the news before.
I am facilitated that my undervolt is still working. The undervolt possibility is a must have for every laptop user as i use it from the first day and if i render my videos, play my games today just for test with turning off the UVs the temps are going into the 90's easily and the fans are like jet engines, the people who know me in this forum know that this fan noise devil does not let me go until today.

As we both have the same system i am sure we get this working at yours too.

Have you updated everything using lenovos website not the vantage software?
There is also an intel management firmware v.12.0 you should update this as well.
I am up to date with everything.
I am using TS version 9.0.

You have two things you can try - make an full sector by sector backup of your Nvme before you do these steps.

- use a small paper clip or something else and press the reset button as long as the hardware maintance manuel tells.
- Enter debug BIOS on the right side there is a description how to do a "debug bios restore" it's an F key i think.
- at last, i do not recommend this as the screws are from a bad quality and no one on earth sells M3x11.5 screws:
open it, unplug the battery as well as the BIOS battery for 5-10 minutes.

Before you do these steps i would first check if it's a software related issue before i go deeper in the troubleshooting.

Let us know any results of the discussed points.

I really hope you get your UV back. The worst case scenario would be buying a Y740 BIOS chip with v8.0 on a well known online marketplace.
But before you start soldering out your old BIOS chip there is a last chance in flashing to an older BIOS version.
Lenovo themselves wrote in v.12 "if you need to rewert to an old BIOS pls do a BIOS reset before". So it should be possible without bricking the BIOS.
But be very very carefull, there are many reddit posts with people having killed their laptops BIOS - maybe they weren't careful enough.


All the best,
Itzap

 

Accessing the hidden bios in Lenovo, there is also an option there for allowing bios downgrade though I never used it.

I am stuck with v1.08 bios since I removed internal battery and the bios cannot be updated by the Lenovo tool without battery present. And by stuck i mean I am happy



@bryanryan
Even though 1mm Gelid pads are working for me more than enough, If I had to do it again, I would try 1,5mm + 2mm for those 2-3 points that had thicker pads applied by the factory just to make sure. The Gelid pads I used seem to be a thermal paste in clay-like form rather than those typical silicone pads used in most of the systems.

 

Thank your the help, but it seems that updating the Intel Management Firmware v.12.0 doesn't do anything.

ThrottleStop V9.0 does let you to unlock the offset voltage, but doesn't do anything even after apply
The reset button doesn't show any Debug Bios, only Bios Setup, still I can acess the Debug Bios by the old way (keyboard pressing). It looks like they really limit access with 1.12.

I know about the screws... I did a clean up of the fans last weekend and one of them didn't want to come out...

Lenovo stated that we need to go to bios, reset to default settings and then downgrade to an older Bios? I never need to do that in the olders Bios. I haven't rollback the bios, because I looked in Reddit and Lenovo Forum and it is a total mess. Y730, Y540, Yoga 930 user are also affected.

I could do a clean install without lenovo reset, but the problem it looks like I can't select Legacies Bios settings.

 

Hello Muzava,

just one thing comes in my mind in my launchbreak - i have disabled intel SGX in BIOS as i does not use secure boot and all the not helpful stuff which manufacturers have invented to enslave their users.

Please check if both is disabled in your bios.
And please tell me what do you mean with legacies are not selectable in BIOS?
Can you change your BIOS mode from UEFI to legacy or not?

I guess we should not focus und how you can rewert to an older BIOS as we have the same chips, same CPU, same BIOS version and the plundervolt BIOS would close the possibility to all users who have loaded this BIOS firmware and not just at yours and mine is still working.
So i think what happens at your particular machine is that it's just a software related issue.
I also remember that i wasn't able to undervolt a year ago after a fresh installation as it's not recommend to install intel XTU, uninstalling it and using TS after this.
I found in a forum that this can cause that your not longer able to UV in FVIR using TS - so i have formatted again, installed Windows 10 pro and installed TS without installing intel XTU before.

Also let us know please what's the result of booting from an external medium and all the other things we have talked about.

On weekend i will spend more time finding more possibilities for you what you can try to get your UV back.
It's just logic that it must work at your machine too except you have another hardware inside your system as i have.



Brgds,
Itzap

 

Hey,

It was suppose to be Legacy Bios (autocorrect )! I can't select the option to select UEFI or Legacy Bios because it is greyed out.

I did the factory reset, because the laptop is overheating in 3 of 6 cores (0, 2, 4 - same side of die) and this happened with UV. Since the laptop is still under warranty, I'm going to send it to repair center (already waiting for the pickup).



I will uninstall Intel XTU + Disable Secure Boot + SGX, just to test before sent it to warranty.

 

Hello,

ok i understand, from what you said it seems like your BIOS is already crashed.
Are you able to re-flash bios version v12 or an older one?

If you haven't removed the heatsink once the repair will be done under warranty.
But in covid times it could take some weeks or months to be finished.

I would try everything before i send it for repair.
I would also try to re-flash the latest BIOS as it seems that yours is damaged - selecting UEFI or legacy is a fundamental bios option which should never be greyed out at all.

I also found this on reddit which helps many people:

https://www.reddit.com/r/Lenovo/comments/kmx6ew/lenovo_legion_y740_cannot_undervolt/

You'll need to go to advanced bios of legion y740 To go to advanced bios of legion y740 Follow those steps

1. Get into bios
   
   
2. While in bios hold FN then run your finger across the keyboard from Q-P, A-L, Z-M (run as in, hold fn button then start pressing q w e r t y u i o p a s d f g h j k l z x c v b n m) Then
   
   
3. let go of FN, 4 . Press F10, select yes
   
   
4. After those steps when PC reboots go to bios once again
   
   
5. Go to advanced tab, go to advanced overclocking and performance menu
   
   
6. Enable overclocking feature and then enable xtu interface

If nothing works, it should be repaired by Lenovo for sure.

 

I didn't rollback to previous Bios or v1.12, because of the known bricking problem.

I did those setup after I got the undervolt blocked and the options were enable, but I will check again.

 

i am on Bios version is 1.12 (AVCN22WWV1.12) for Legion Y740-15ICHg (i7-8750H).

lenovo locked the undervolt feature, now my laptop is hot as toast sadkek

 

Rewerting to an older version than v.10 might brick the BIOS.

But reflashing the current one has never killed a BIOS if the chip is ok and the BIOS is not modyfied by users.

This is from the official lenovo readme of the latest BIOS v12:

Important notice:
###################################################################################################
Do not flash back BIOS to AVCN16WW or earlier, because we implement new function and kernel update.
If you have to roll back to previous version, please load default in SCU manually.
###################################################################################################

So translated: Flashing back from ACVN22 to 17 is possible everytime.
Flashing back beyond ACVN16 is possible but you have to reset BIOS as recommend in my posts above.

A manufacturer won't write this in a BIOS readme if users would detroy their systems with it.

To test it by myself i have flashed back to BIOS 1.06 (with max fan FN-Q) on my Y740-15iCHg 8750h and flashed back to the latest version 12 today.
On both undervolting was possible everytime. Everything works like before and i am 100% sure you guys don't have other chips in your machines than i have.

But as your BIOS seems "damaged" already @Muzava i wouldn't recommend to flash back to an older version, first of all i would reflash your current one with doing all the reset steps before.
Also reinstall your OS or boot from an external drive.

Wish you guys good luck as macdid wrote i would stop using and sell a gaming laptop which has no UV possibility as well.
UV gives so much feelable advantages no one wants to miss.

You guys could also call Lenovo support tomorrow before arranging a pickup for repair.


Itzap

 

In the past I have rollback to V1.06 and it was fine. Now I will not try again, but the strange thing this only happen after a factory reset... But yeah, my bios is probably semi-corrupted.

I'm in conversation with Lenovo, because of the heating problem and thye will pickup the laptop during this week.

Thank you for your help and I will give feedback soon I get the laptop from Lenovo center.

 

I repasted my laptop, and tried to fix one of the broken heatsink connections 2 weeks ago. Did some testing last week.

Repasted with gelid GC extreme. Used to have grizzly kryonaut for the last year or so. Also I put new thermal pads (0.5 mm, just stacked to get 1.5 - 2mm thickness. Did according to the guide posted by some one earlier). Pads were just some generic ones.
I had put new thermal pads year ago, but did it again anyway.

1 week of testing. The heatsink fix didnt work and the ribbon/connection broke almost instantly. Was worried that the GPU temps would spike again. BUT, I was wrong. Used to run my CPU with max 36 TDP and UV to get the temps to an OK level, and even then GPU would thortle at 78C. Now with the GC xtreme, running at full 45W TDP on CPU and OC on GPU, Iam seeing max temps of 83C on CPU and 73C on GPU.

And thats in Battlefield V, so its 45W tpd max on the cpu anyway with combined load.

So thats a BIIIG difference. It seems you guys were not kidding about the Gelids thicc paste

Have to whip out the old soldering station for the broken heatsink connection someday. But now that the temps are good, Im not in a rush. Not too comfy about my soldering skills on electronics...

 

Ok, so I tried to downgrade from v1.11 to 1.10 before reading up here, and now my machine seem to be bricked. It won't boot past the Windows logo and I cannot seem to enter the BIOS.

Are there any way to force reflash to v1.11 to see if I can rescue it?

EDIT: It seems there's no easy way to fix it. Guess I'm getting a CH341a SPI Programmer to fix the BIOS chip.

No way I'm getting into this mess again - which BIOS version is "best" overall as I'm going the long way?

 

Have you tried resetting bios to the defaults by disconnecting bios battery after downgrade?

Also, have you tried this method: https://forums.lenovo.com/t5/Gaming-Laptops/Y540-BIOS-Recovery-Mode-Flash-BIOS-from-USB/m-p/5026109

 

Yes, I did. No dice. It's bricked. I'm putting my faith in the programmer. Should arrive friday.

 

Feel sad to hear that.

As i was able to go back to 1.06 and back again to 1.12 on weekend i guess it's just luck if the BIOS bricks or not.
In another forum i've read that you always have to update intel management firmware on the same day you update the BIOS.

About plundervolt: https://plundervolt.com/

As it's all about Intel SGX - i have never used SGX and Secure boot on my system so maybe thats's the reason why undervolting was working in all BIOS versions.

Just to explain or find the reason - i know this does not help you guys.

About the SPI programer it's not a hard deal if you know what to do and it costs a few euros / dollars at the end.
Wish you good luck @Muyfa666 and please report us your results!

 

Thanks. I found a very detaield guide on how to do the reprogramming, so it should be fine I hope.

What BIOS would you say I should backflash to? Which was the last known to work fine without limitations? V1.08?

 

This situation it's starting to get out of hand... because the probability of more people getting the laptop bricked is high.

You will probably be fine with the eeprom programmer, but make sure which eeprom bios is installted in your motherboard. I have read that are 2 models, a Winbond and a XMC (or XMB, i don't remember the name).

 

Hello,

be very carefull with programming and positioning the programmers clip as if you connect the clip in a wrong way it could burn your bios + motherboard.
It's long time ago i have programmed a graphic cards or motherboards BIOS this way but i have programmed CCTV home security cameras firmware on that way and it's not a big deal but think triple before you do the next step. Also don't forget to ground yourself when you touch the mainboard or BIOS chip.

The BIOS version depends on your likes. Many people prefer the > 1.09 the very first BIOS versions with FN+Q.
I miss FN+Q not that much, im fine with the latest version as: Balanced gives me 0 fan noise till 58°C CPU temp and Power gives me max TDP and max Power for my GPU under stress and a 35-40C ° idle temp with low RPM fans under desktop usage / homeoffice. Quiet profile is horror for me as it let the fans run on low RPM which gives me the loudest jet engine tone.

@Muzava your totally right, Lenovo should release a major warning to not downgrade the BIOS as it's a 50/50 chance to brick your BIOS, have never heard that in the last 30 years from a mainboard manufcaturer, but even it's bricked there are ways to get it back without RMA'ing.

Another tipp for lowering your temps, i read on so many forums that their Y740 are burning while gaming.
UV the cpu is just one thing to get it cooler. Correctly UV the graphic chip is a much bigger deal when it comes to gaming.

I play since may 2019 on average +/- 1600mhz on my RTX2070mq max voltage is 700mv - flat curve on afterburner.
My 2070mq never reach the 70°C while gaming - using phobya nanogrease extreme + the stock thermal pads.


Fingers crossed for all of you, don't let hope go - the bios seems to be corrupted but not damaged.

 

It is my first time to see this happening, but the UV locked problem is affecting all laptop manufcaturer. At least I haven't heard Bios being bricked from rollback in Asus, Dell or HP (user are able to rollback without problems).

I use MSI Afterburner to OC/UV (+225 MHz core) my RTX 2060, but the 2060 is cooler than 2070 or 2080, normal temperatures are always 64-66cm, the problem now is really the CPU temperatures.

Hopefully Lenovo doesn't mess up the repaste or I will need to do it myself...

 

Totally agreed, i'm not sure if this was my first lenovo gaming laptop and my last.
I would like to have a adjustable fan curve and more customer support - take a look at "bring back fan control" thread in official lenovo forum.
Sorry to say that but lenovo is giving a f*** on their users not a single reply by a mod or supporter.

These temps on your gpu are awesome! At the time, I also thought long and hard about whether to go with the 2060 or 2070mq. The 2060 is perfectly adequate.

The lenovo "smurf goo" like Bob of all trades named it is also great i think you don't need to repaste as i saw not a big difference.
The shape of the heatsink is more important.
I have 2 heatsinks directly from headquarter lenovo in tw here, on both the PCH, CPU and GPU surfaces are totally different uneven.

I hope to read in the next days posts from very happy users brought their systems back to life!
All the best to you.

 

I'll be very careful before trying this.

But to clarify; pre v1.09... but which one of the pre's? Is v.1.07 the magic number?

 

I have the same feeling, but the Y740 have very good build quality and it was stupid form Lenovo killing the Max Fans in V1.09. After CodeHusky created the post in Lenovo Forums (I was one early reply), I did some digging between Bios and discovered that they changed the CPU PL1 and PL2 in all settings (in V1.06, it was 45W and 60W maximum) and I think they change another CPU settings in the Advance Bios. In V1.06, I had temperatures of 84/85 without undervolt and after the update it got always thermalthrottling (94c). Also in early Y740 life we had the old Lenovo Vantage (much better) and they launched the V1.09 together with the current version of the Lenovo Vantage.

In my opinion the sweet spot of the TGP is 80-90W, but in RTX 3000 is the max-q versions! The RTX 2070 Max-Q is 5-10% better than RTX 2060, but you have more 2GB (makes a good difference in longevity).

Yeah, I remember Bob review and it was one the reason to buy the Y740 (it was true before Lenovo started to screw the Bios). I bought my Y740 for 1500€ (with 25% discount = 500 €) in May 2019 and it was much better than buying a GTX 1060, Plastic, Bad Screen Laptop for 1300 €.

I know that the problem with laptop is the heatsink not being uniform (flat). Last January, I did a repaste job in my Acer Aspire V Nitro Black Edition (VN7-591G) and screwed the screw one by one in cross screwing technique (like engine cylinder head) and it was fine!

I never found the V1.07 in the wild! It suppose to have a TGP Limit of 90W for the GPU.

 

Hello guys,

i must say it feels good talking with people everyday which have the same interest - that's the sence of a forum

I remember the first BIOS version i had on my in may 2019 purchased Y740-15ichg the BIOS version 1.06 on it and it was great.
I have saved nearly every single BIOS version, driver version, and other chip firmware versions on my NAS.

@Muzava i totally love my Y740 if i am able to fix one day the turbine jet engine fan tone from my fans it will be my laptop.
I can confirm: I am on 1.12 (the latest one) and my RTX2070 Mq still pulls 90+ watts so i am totally fine with the latest bios but still missing the manual fan curve or manual max fan.
Also my CPU can pull 45W PL1 and 60W PL2 but i have capped both power limits to 45watts.

I will try the heatsink screwing cross technique as well for my next repaste, for now the phobya nanogrease extreme is doing a great job (same temps on every core since my last repaste in april 2020).

I can check on my NAS for V1.07 when i am at home from work.

EDIT: I have Bios version 1.08 till 1.12 on my NAS, i might haven't saved earlier versions on my NAS before my Samsung Evo Plus was faulty last year and i did a fresh install.
The BIOS versions will be saved at C:\Drivers\ i have not made a backup of this folder.

EDIT2: And i have 1.06 on my local storage.

 

I have these BIOS versions saved for my Y740-17:

BVCN07WW.exe => v.1.03
BVCN09WW.exe => v.1.05
BVCN10WW.exe => v.1.06
BVCN11WW.exe => v.1.07
BVCN12WW.exe => v.1.08
BVCN14WW.exe => v.1.10
BVCN15WW.exe => v.1.11

Should I go with v1.07 then? Or v1.06 even? I think v1.07 was what my laptop came preinstalled with when I bought it.

 

Thats great keep them saved as they will disappear form the web!
Do you also have the BIOS release notes?

Then check the notes first - as we talked before 1.03 till 1.09 gives you FN+Q i guess all versions within that would be fine.
With 1.10 came the plundervolt fix as far as i read in the last days.
I guess mine was shipped out with 1.06 or 1.08 i don't remember exactly.

When you flash your BIOS chip disconnect the big battery before just to be sure - i read something in another forum minutes ago.
Don't know if they told you in the guide you have.

I am curious if it works for you as well, good luck!

 

I have both the EXEs and the TXTs saved for a rainy day. I can share them if anyone wants them.

As v1.06 seem to be liked by many I guess that's what I'll go for.

 

Here's the summary of changes for all versions I have if anyone is interested;

BVCN07WW: (v1.03)
1.Set graphic mode default to [Discrete Mode] for all SKU.
2.Add recovery mechanism for VGA throttling Power DC protection.

BVCN09WW: (v1.05)
1.Update includes some security fix. (PCR# CP20190221_0004).
2.Fix : Unit hang up at "Lenovo" interface during flash BIOS V1.04.(TDMS #198861)
3.[Modified]BKOFF pull high after ENBKL 1S.

BVCN10WW: (v1.06)
1.Improve user experience and fan cooling function.
2.Improve camera imaging quality when system idle.
3.Add HRD function with iGPU.

BVCN11WW: (v1.07)
1.Code enhencement for Windows 19H1 support.
2.Code enhencement for TG device.

BVCN12WW: (v1.08)
1.Enhancement to address Security vulnerability CVE-2019-0123, CVE-2019-0117, CVE-2019-11135.
2.Enhancement to address Security vulnerability CVE-2019-0185.
3.Enhancement to address Security vulnerability CVE-2019-0154.
4.Enhancement to address Security vulnerability CVE-2019-6171.
5.Enhancement to address Security vulnerability CVE-2019-0131, CVE-2019-0165, CVE-2019-0166, CVE-2019-0168, CVE-2019-0169, CVE-2019-11086, CVE-2019-11087, CVE-2019-11088, CVE-2019-11090, CVE-2019-11097, CVE-2019-11100, CVE-2019-11101, CVE-2019-11102, CVE-2019-11103, CVE-2019-11104, CVE-2019-11105, CVE-2019-11106, CVE-2019-11107, CVE-2019-11108, CVE-2019-11109, CVE-2019-11110, CVE-2019-11131, CVE-2019-11132, CVE-2019-11147.
6.Gamezone smart fan mode logic enhancement.
7.Battery report enhancement.

BVCN14WW: (v1.10)
1.Fix extended monitor issue with lid closed in switchable mode.
2.Update ME to 12.0. 65.1567
3.Enhancement to address security vulnerability CVE-2019-11157, CVE-2019-14607, CVE-2020-0548, CVE-2020-0549, CVE-2020-0543, CVE-2020-0529, CVE-2020-0528, CVE-2020-8321, LEN-27433, CVE-2020-0531, CVE-2020-0532, CVE-2020-0533, CVE-2020-0534, CVE-2020-0535, CVE-2020-0536, CVE-2020-0537, CVE-2020-0538, CVE-2020-0539, CVE-2020-0540, CVE-2020-0541, CVE-2020-0542, CVE-2020-0545, CVE-2020-0566, CVE-2020-0586, CVE-2020-0594, CVE-2020-0595, CVE-2020-0596, CVE-2020-0597, CVE-2020-8674.
4.Fix:Win10 20H1 HLK failed on ACPI logo test item.

BVCN15WW: (v1.11)
1.Update ME to 12.0.71.1681.
2.Enhancement to address security vulnerability LEN-48100.
3.Enhancement to address security vulnerability CVE-2020-8696, CVE-2020-8698, CVE-2020-8695, CVE-2020-8694, CVE-2020-10255, CVE-2020-0570, CVE-2020-0571, CVE-2019-14556, CVE-2019-14557, CVE-2019-14558, CVE-2020-8670, CVE-2020-8671, CVE-2020-8672, CVE-2020-8752, CVE-2020-8753, CVE-2020-8745, CVE-2020-8750, CVE-2020-8757, CVE-2020-8756, CVE-2020-8760, CVE-2020-8744, CVE-2020-8751, CVE-2020-8754, CVE-2020-8761, CVE-2020-8747, CVE-2020-8755, CVE-2020-8746, CVE-2020-8749, CVE-2020-8705, CVE-2020-12303, CVE-2020-12304, CVE-2020-12297.

 

Thank you very much for posting these release notes!

CVE-2019-11157 is the bad guy in v1.10 !!

Yes 1.06 seems to be the golden BIOS version.

 

I had the Bios V1.06 and V1.08, but I don't know how I deleted them! Mine was shipped with V1.06, but V1.08 was the must stable variant for the Y740-15ichg.

Normally I turn off the PL2 and use the PL1 as reference, becasue the PL2 doesn't make any sense in the real world applications.

 

Could you share them via google drive? I would like to have a copy also for rainy day.

 

I don't have Google Drive, but I can arrange a Dropbox-link when I get home from work.

 

Thanks, whichever way for you is more convenient.

 

https://www.dropbox.com/sh/ktr609tgseap3q5/AACQFotuGlQR_lJVrgcWNQmwa?dl=0

 

Thanks, I will keep this too!

 

No success. I will have to contact Lenovo. Too bad I'll probably be stuck with v1.10-v1.12 BIOS after service. Oh well.

 

Did you check which Bios Chip you have? Becasue there is two version, one Winbond and one XMC.

 

XMC.

 

I read the guideline for eeprom programmer and it seems not all programmer work with XMC or Winbond chips.

My Y740 return from after 3 days (went tuesday to repair and returned today) and it seems fine in terms of temperatures. Bios is still the same, V1.12 and locked UEFI option.

Still 57W in the CPU and nice temperatures! But Average Clock seems rounding 3.7 GHz.

 

Update:
The temperatures are still OK under CPU only load, under CPU/GPU load (gaming) the temperatures are higher (normal). I have set the PL1 45W and PL2 60W (like in Bios V1.06), but the CPU clock is much lower compared before the Repaste and with undervolt.

I tried to install the V1.12 again and it work without problem.

I have sent an email to Lenovo Technical Assistance asking about the bios rollback to V1.06 and V1.08 and I will give feedback about their answer.