@YoKelly I have the very same problem with a WUP50 mainboard. I have no solution so far. It is strange. I could install ISFSHAX using defuse, but still no chance to trigger PTB.
NEW DISCOVERY: I think its an Aroma problem. I booted into Tiramisu and everything worked. Something there is corrupted.
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I FIXED IT!! It was just I had to update Aroma