I was wrong, turns out ANY modification will result in the same exact black screen. I even tried to modify a single byte in a seemingly unused section of the bios and that also resulted in the same blank screen. Anybody knows why?
All the tests I did were with battery detached, secureboot disabled, no supervisor password, no bitlocker.

That aside, I also wondered if the bcdedit method to blacklist memory pages from within Windows works. So I run a memtest86 again, I narrowed the bad ram zones to a surprisingly few pages and set up everything according to this unbelievably detailed...

I did it anyway and got a black screen unfortunately. I then wrote back the original bios dump and the laptop booted correctly again.
I'm 100% sure the procedure completed perfectly, asprogrammer didn't give any errors and the modified bios CRC32 matched as expected. So I think the issue is the ram disabler script. Anybody has any idea?​
At least now I know that i can rely on the backup in case things go south, so i can do more tests with a clear mind now. Will keep posted.

I managed to get a ch341a programmer. Managed to read a dump of the bios with AsProgrammer v2.1.1. The ram disable script did 24 replacements. The bios chip is a W25Q128JWSQ 2034, the mobo is a NM-C801.
I'm ready to pull the trigger but I'd like a confirmation first​....

Ok, it's NM-C801. It was printed under the heatpipe so i couldn't see it....

When using a programmer, is it even necessary to mess with the FL1? Can't I just dump the bios, apply the script, write it back?...

I don't have the expertise nor the tooling to attempt that, I would keep that as a last resort. The motherboard model seems to be just the laptop part number above and the version is 0B98417 WIN....

Thanks for your reply..
Ok what software do you recommend to get bios dumps? Also why do you recommend a hardware bios programmer over software for flashing....

Good day,
In my hands I have a Thinkpad T14 gen 1 (20UD002BIX) showing sporadic BSOD issues caused by failing onboard soldered RAM. I suspect disabling the onboard RAM via a bios mod would do the trick.
The laptop has already the latest updates as well as latest bios 1.51 as of today.
I informed myself in an attempt to DIY my way to victory but it left me with more questions than answers. This is not a BIOS request, what I really need is somebody to verify that the following procedure is correct.

Step 1: grab a bios image:
- Method 1: from the official website:...

There have been one-too-many instances in my life in which a better understanding in how motherboards and bioses are handled could have helped, so there I am!