the offset for shutdown exists in the bios, … but you have a broken ME FW - 0.0.0.0? CMOS RESET ,.,or ME FW tools “from EFI or DOS”.,.or try last bios
flash with HWflasher can also break the system “impossible flashing MSI official files !!!”
edit
best to start with ME system tool “MEManuf .,.in EFI” find more info.
it is possible that your problem is not related to ME FW at all “or have HWdefect on this chip”
,.,. ME system tool 300series for debug info ,.,.no flash !