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AsRock B450M Steel Legend boots back to UEFI with CSM Disabled

Ok guys, i tried to disable CSM on my mobo in order to enable Above 4G decoding and RE-Sizable BAR, something i did many times before on other similar boards, but this time it doesn't want to boot into Windows and brings me back straight to the main page of the UEFI w/o me pressing F2 or DEL. I tried disabling it, then enabling both option, then enabling CSM again, but when i boot into Windows, SAM on my RX 6900 XT is "unavailable". GPUz says that these option are disabled in BIOS. When i go back to BIOS they stay enabled, but they are grayed out like inactive options, until i disable CSM again. BIOS is the latest version and i have done this exact thing many times before on other B450 and B550 motherboards and never had any problem logging into Windows with CSM disabled. What is going on?


Ok i think i found out the culprit. For some reason my system drive is on MBR instead of GPT and for even weirder reasons, i can't convert it. Looks like another full system install is incoming 馃槙

| Ryzen 7 5800X3D | Arctic Liquid Freezer II 360 Rev 7| AsRock X570 Steel Legend聽|

| 4x16GB G.Skill Trident Z Neo 4000MHz CL16 |聽Sapphire Nitro+ RX 6900 XT |聽Seasonic Focus GX-1000|

| 512GB A-Data XPG Spectrix S40G RGB | 2TB A-Data SX8200 Pro|聽Phanteks Eclipse G500A |

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