List of 9550 BIOS updates?

Hi all,

Just wondering if anyone has list of all 9550 BIOS updates with description of fixes for each? I'm still running a much older 1.2.0 BIOS and I'm wondering if it's worth updating or not, since I haven't encountered any major issues

Thanks

 

Bump. No one?

 

A few people had published the historic drivers link in this forum

http://downloads.dell.com/published/pages/xps-15-9550-laptop.html

 

Awesome! Exactly what I was looking for!

Would you recommend 1.5.1 BIOS or an earlier one?

Thanks!

 

Thank you. I'm currently still on 1.2.5 so watching new releases and have been maintaining this information manually to date but this page is much more useful.

1.5.1 - URGENT

1. Enhance audio quality when the brightness is adjusted
2. Extending battery support
3. Allows Dell Command Configure to implement the required Thunderbolt Sec Level settings without the need to access the BIOS.
4. Fixed a Bitlocker recovery issue when Dell Thunderbolt Dock is connected to the system, and PCR1 is selected in the Bitlocker Group Policy
Updated Dell Dock Port Type Classification in SMBIOS Table
5. Fixed a Bitlocker recovery issue when Dell Type C Dock or Dongle is connected to the system, and PCR2 is selected in the Bitlocker Group Policy
Improved PCR2 measurement consistency when a Dell Type C Dock or Dongle is connected.
6. Updated the handling of pre-boot authentication information by firmware.
Updated UEFI variable input validation.
Updated the handling of 3rd party Option ROM loading.
Updated SPI flash command configuration settings.​

1.4.0 – URGENT

1. Fixes system defense with wireless parameter will cause ME failure
2. System stability enhancements
3. To prevent user update ME Firmware to blacklist 11.6 ME firmware
4. Correct error message in Excalibur
5. Fix Bitlocker issue on Win7 ultimate/enterprise​

1.3.0 – URGENT

1. Enhance dock's audio performance​

1.2.25 – URGENT

1. Updated Intel ME Firmware to address security advisory CVE-2017-5689 / INTEL-SA-00075"
2. Support TPM 2.0 on Win7​

1.2.21 – URGENT

1. SUT will show incorrect massage after run DG_Readinesstool_v2.0.ps1 on Enterprise OS
2. Clear TPM Option greyed out in BIOS
3. Enable Attempt Legacy Boot" cannot be enabled in BIOS
4. USB LAN and Audio of IE dock still working after disable Dell Docks and Ext. USB​

1.2.19 – URGENT

1.Fixed Pre-OS has no display on external monitor with Lid Close issue​

1.2.18 – URGENT

1.Fixed system may drop battery un-expected
2.Improve PCIE NVMe Stability
3.Fixed Panel flick issue
4.Fixed Microsoft Bitlocker issue
5.Improved the DELL ThunderBolt Dock Stability
6.Fixed ST Microelectronics Motion Sensor Driver shows disabled while spindle HDD +mSATA installed​

 

Wow, so I updated to 1.5.1 from 01.02.00 and the fan seems to be on 24/7 even during idle. I have my system heavily undervolted so it never gets hot and the fans rarely came on...
Is there any way to fix this on 1.5.1?

 

After updating to BIOS 1.5.1, my XPS 15 9550 has become very slow in loading almost every program and shutting down the system. I just downgraded to v1.4.0, and see that the issues seem to go away. Another weird thing that I noted from previous BIOS versions that I cannot install BIOS from Windows 10 first time. First time when I run BIOS install, the system does not upgrade the BIOS. But, when I re-run it second time from Windows 10, it upgrades after reboot. Has anyone had the same experience?

 

yea noticed same thing. it is very slow moving from program to program. I'm probably going to downgrade the bios as well.