Don't forget that one of the features of this board is that it has 2 BIOS chips installed. When you are on BIOS 1 and flash it to a newer version, BIOS 2 is not automatically updated. You have to manually update BIOS 2 as well. What you are experiencing is the the BIOS switches to the second chip if you use settings that prevent it from booting. The best thing to do is set up BIOS 2 with safe settings that you know are good so if your settings for BIOS 1 don't work, you can still boot from the other BIOS.
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