Great find but I think Safedisk also had some old BIOS for Apex on LGA1200 but it was not a solid BIOS, just only made to run on Win7 it’s on HWbot forum. Might be a similar case. Edit - ASUS released a new BIOS for Z590 at hwbot which has Win7 and XP support, they won’t A5 BSOD I guess However if those are correct and accurate that means there’s a CSM option even on Z690 however not sure how Windows 7 can handle these small cores. Raptor Lake is even going to add more E cores to the mix. Win10 also has issues if we see Anandtech on ADL handling at the moment as per their take.