Lenovo Z410 InsydeH20 BIOS Recovery - how? filename?

No boot. No POST. Blank Screen. Power and Battery lights, and fans on. Last action before the problem, was running 8DCNWW40 BIOS update from Lenovo website. When this started about 2 months ago, it would boot up OK every 50+ tries. Now, I've been trying hundreds of times for 4 days.

When I ran Andy's BIOS tool, It suggested Zx10X64.F?
In platform.ini, there is AA and BB.

Before connecting AC, I hold down Fn+R, and when laptop powers up the battery light is orange blinking. The USB drive lights up after about 6-7 sec. With 1 USB drive attached battery light blinks ~18. With 2, ~21. If there are lots of files on USB drive, 2-3 blinks more. Its searching for file? After that the same as "usual powerup". Faint clicking from speaker(like its in a infinite loop), fan on, both power and battery light on. Also, if you remove or attach AC power while its on, there is VERY LOUD BEEP.

I have 2 USB drives I formatted clean. 128MB FAT. 16GB FAT32.
I put the unzipped WW40 BIOS, as diff filenames alone and together with different variations that I tried:
BIOS.FD .BIN .ROM
AA.FD .BIN .ROM
AAHW.FD .BIN .ROM
BB.FD .BIN .ROM
BBHW.FD .BIN .ROM
Zx10X64.FD .BIN .ROM
Z410X64.FD .BIN .ROM
Z410.FD .BIN .ROM
8DCN40WW.FD .BIN .ROM

All same result - after the ~21 blinks, goes to "usual" non functioning state.