i too am getting that post code error 54 and other intermittent quirks like intermittent shutdowns and restarts with p05 - i have notifed saaya and lardarse about this

i have flashed back to G27 where i had no problems

i apolgise if i was pushing p05 bios, cause normally flashing to the latest bios is always recomended by the manufacturer, in this case it did not work out

but it was up to each individual if they wanted to flash or not

as the old saying goes - if it ain't broke don't fix it

Best Regards
flanr