I brought in the i9-9900K.
I brought in the i9-9900K.
From pressing F11 onward, the BIOS will accommodate the i9 9900K processor.
Installed the F14 BIOS, it appears to flash DRAM and the CPU on the board is leading.
Maybe your RAM isn't matching the current specs anymore. It seems like an update changed the frequency from 2400MHz to 2666MHz, and the system rebooted after removing the old one.