I think I fried my Impact, after last LN2 session it doesn't want to OC anymore - if I change settings from CMOS default eventually I get 41 code which afterwards is followed by 00 code with fans at 100%, after clear CMOS it boots (on stock ofc). Also the settings (multi, BCLK, voltages) I input in BIOS are not applied - everything runs on auto.
@websmile gave me an idea that maybe MEI could be the issue here, and it might be back to normal if I could recover it. But no idea how to do it.
I already tried flashing BIOSes 0205, 1302, 0002, 0014 - without success (with EZFlash or using USB Flashback). Rest of components - CPU, RAM, GPU - are OK, tested and working in GB Z170x SOCF. I also cleaned the CPU socket, checked that pins are OK, and checked RAM slots.