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You're experiencing issues after updating your BIOS with Dragon Center on an x390 Meg Ace running a 3700x. The problem might stem from instability caused by the update. Checking the little debug display for consistent readings could help identify if it's stuck at 22 or freezing at 0d. Consider reinstalling the BIOS or consulting official support resources for further assistance.
The jumper on your motherboard can reset BIOS settings and restore them to their original state. Clearing it also lets you change the BIOS password. To do this, power off your PC, locate the jumper near the CMOS battery, set it to Clear/CLR, then turn it back on after rebooting. If you want a permanent fix, replace the CMOS battery and follow the instructions for that method.