What happens when you switch to the 2nd BIOS by pressing the red button that is labeled BIOS_SWITCH on the PCB at the bottom right corner of the board (under sata ports). Does it stay stable on that BIOS? I would stop flashing the BIOS using ROG connect if you are already on the latest 1202. Do you get any other red LED lights under the debug code? Have you tried a CMOS reset? We need to know more specifics of what you have tried.
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