Question Cannot access BIOS anymore


Mar 4, 2018

I can't access BIOS on my MSI B450 Tomahawk, it was working fine previously but it seems taking out one of the HDDs may have messed up the boot code within the UEFI, and yes it will not boot on UEFI, but does boot up on CSM.

I had reflashed the BIOS using BIOS flashback and I was able to access the BIOS, and it was on CSM mode. When I changed it back to UEFI, now I can't access BIOS. And restarting whilst in Windows won't even load the OS.

Help will be deeply appreciated, thanks.


Motherboard: MSI B450 Tomahawk

CPU: Ryzen 5 3600 3.6GHz

RAM: Corsair 2x16GB 3200MHz Vengeance LPX DDR4

GPU: PowerColor RX 580 8GB

PSU: Corsair CV550 550w

OS: Windows 11 Pro


Have you tried clearing the CMOS, disconnecting the system from the wall and display, then removing the battery for 0 mins, pressing and holding down on the power button for your case, then to return the battery after 30 mins?

Did you install your OS while CSM was enabled? For the sake of relevance, what BIOS version are you on for your motherboard?