I want to enable Secure Boot on my AX370-GAMING K5, but it seems like disabling CSM support in the BIOS results in no bootable media. According to my TenForums thread, it could be to do with partition style. All my drives are MBR. Using GPTGen resulted in nothing, and AOMEI Partition Assistant is telling me I won't be able to boot if I convert to GPT.
Before resolving that problem, I need to know for sure MBR style is what's restraining me from disabling CSM support so I can enable Secure Boot.
"Many PCs now include the ability to use the UEFI version of BIOS, which can speed up boot and shutdown times and can provide additional security advantages. To boot your PC in UEFI mode, you'll need to use a drive formatted using the GPT drive format."