Memory problem after BIOS update

[MrWeepz]

Hello,

I've got an old Xeon PC where I have 4 PC4-2666 RAM sticks from a decommissioned i7 PC. Everything worked fine until I decided to update BIOS to the latest P61 v2.86 (or v2.85). Right after that the PC started failing to bootstrap with 3 long 2 short beeps which means "memory failure". I confirmed that it's a memory issue by trying out a PC4-2400 RAM stick that I happened to have. I doubt that all 4 RAM sticks stopped working right during the BIOS update.

I think the PC previously had P61 v1.67 BIOS, but I can't find it anywhere so that I could downgrade. Where can I find previous BIOS versions?

Also, do these abovementioned PCs have the same motherboard? When I had the i7 PC I tried putting the Xeon CPU into that "i7" box and it worked (the native i7 had been gone hence my experiments). This gave me an idea of trying to switch my current Xeon PC to P62 BIOS, but it doesn't let me "upgrade" to another BIOS.

I'd appreciate any options to revive my PC. Currently it's unusable.

[MrWeepz · Accepted solution]

I "solved" the problem by reverting to P61 01.75 which I miraculously was able to find in Security Bulletin Archive. I don't get why there is no single page with all the previous versions of BIOS. The next version of BIOS I found was P61 02.40 and it has the same bug of not supporting PC4-2666.