ThinkServer TS460 - Forgetful BIOS

I just got a Lenovo ThinkServer TS460 for cheap, I managed to reset the IPMI password without a monitor. But, after updating the BIOS to the latest version and clearing CMOS, the BIOS settings are never applied when i Save and Exit. I have replaced the CMOS battery, reflashed the BIOS, pulled out the TPM module, and the RAID card. But still, the BIOS doesn’t save the changes i am making. There does not seem to be any interesting jumpers on the motherboard either.

I could use a clue if anyone have had similar experiences :smiley: