I had a similar experience to yours. I ended up reseating the memory gpu and check all connections. redownload new bios to formated usb , cmos then connect usb to rog flashback port. push rog flashback button till it flashes. If fingers are in way you can watch orange light on bottom of board next to bios 1 to verify that it is flashing. Then I was able to get out of the strange loop it was in. It was like a corrupt file the first time
Maximus XI Formula, I9-9900k, Phantex Evolove X, Seasonic Titanium 850W, Custom loop PE360+SE360 Rad, G.Skill Trident Z F4-3200C14 32g, Nvidia Reference RTX 2080 TI, Samsung 970 EVO Plus 1Tb, Windows 11