Just wanted to give everyone a heads up, I was able to locate BIOS updates for Z390 Phantom Gaming 4S/ac on iBUYPOWER's FTP site. Like ABS, they also use the board in some of their rigs.
Looks like the latest BIOS update for this board is 1.21A, released August 2020.
Just flashed it on my rig and it works fine. Not sure what all is fixed. I'm hoping it fixes my XMP problem where the system halts randomly. Time will tell.
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