If it fails which I think it will... Can you try this image? https://users.armbian.com/piter75/Armbian_21.05.0-trunk_Nanopim4v2_buster_current_5.10.18_minimal-stability-fix.img.xz It contains a fix/workaround to dvfs issues I found and makes all of my M4V2 units running stable. Tested with hours of memtester running without failures. It failed pretty quick without the fix.