From what I recall he could install both from scratch as long as there wasn't any MVME (or perhaps anything) in his m.2 slots, and he included his latest EFI. Not sure his bios settings though..@PoMpIs
Did you have any trouble installing Monterey from scratch on your AM5 system (which I believe is on its way back to where it came from )?
I’ll provide more details of my misadventures with Monterey later this evening! Will also attempt Ventura soon.