Question MSI B550 Gaming Edge WiFi + 5900X won't post after BIOS update

wr3zzz

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Dec 31, 2007
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The ex-factory BIOS was 1.2 and everything was working fine when I used MSI Center to update it to 1.6 so I can get resizable BAR to work. Now system won't post with LED debug light flashing CPU.

I am paranoid to revert the BIOS using the flash button. I've already RMA a previous board because the MB flash button was <Mod Edit> up. MSI accepted the RMA and sent me the one that was working. Supposedly the previous one was a defective board but its ex-factory BIOS was not 5900x compatible and I've tried various USB thumb drives to try to get it to post to no avail. Then I started reading posts and youtube video of how people broke their MB by flashing the MSI board the wrong way or using the wrong USB stick.
 
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