do first a BIOS dump in BMC. i can convert to a RBU to flash it back to original.So I also purchased a Gigabyte MZ32-AR0 REV 1 and it was already updated to accept the Epyc 7663 that I purchased as a bundle from tugm, but mine is on BMC 12.49.06 and BIOS M18
check BIOS chip size(25q128=16mb,25l256=32mb)
have heared from some the board stopped work after update firmware.Would his boards be any different than what you guys are using?
maybe newer BMC Firmware is unstable, i don't know.
i know some BIOS versions do a VR update. this can cause issue because i don't know what tugm has done.