How to downgrade microcode? 0x12B is worse than 0x129 for me

[pfn]

I have a Z690-I ROG STRIX with 13600K

Before the 0x129 microcode, certain applications (digikam facial recognition) caused my PC to crash. Most everything else ran OK. After updating to BIOS 3802 w/ 0x129 microcode, my PC was able to run digikam facial recognition just fine, and cinebench also worked perfectly.

When the 4001 BIOS version was released including the 0x12B microcode, I updated and migrated my settings. Since updating cinebench always crashes after starting a benchmark, and running digikam facial recognition causes my PC to crash again. I've tried reverting to BIOS 3802, but it seems the microcode update is persistent.

How do I get back onto 0x129 microcode?

[pfn]

Hmm, Intel CPU ID says I'm on CPU revision 129, but CPU-Z says revision B0. I'm a little confused whether I actually updated/downgraded. Maybe my undervolt + v/f setpoints are too aggressive now (-110mV and +5mV at points 7-11)

[pfn · Accepted solution]

Hmm, I was looking at the wrong field of CPU-Z, it's only visible in the exported report under About -> Tools -> Save report.

Downgrading BIOS did downgrade microcode, now to figure out why my PC still crashes, I'll try a less aggressive undervolt.