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No! What exactly is this?

Hello guys, Please, I need your help. I have a XII Apex and I would like to know if by chance someone has already managed to get back from the new bioses 2101/2102/2103 (11th gen support) to the old ones 0901/2004? I gave up on the 11900k and decided to keep my old 10900k but unfortunately with the new bios I am having some issues. For example, my Dimm 2 (m.2) slot sometimes is not recognized by the system, the ethernet adapter disconnects out of nowhere, and I can no longer use the same voltage and clock on the 10900k as I used on the bios 2004. I've tried to go back to bios 0901/2004 through UEFI and through USB and it doesn't work properly. Actually, Bios is updated, but I can't boot. The QCode led display enters in an infinite loop when I put any bios prior to 2101. Please, does anyone know how to fix this? Thank you!