![]() Performing an in-place conversion of that MBR to GPT disk without needing to reinstall everything sounds great in practice. You can't start flipping toggles to set your BIOS to UEFI mode until AFTER you convert your boot disk from MBR to GPT (actually, you can flip some of them, but YMMV in terms of boot stability). Your BIOS will have CSM set to "Enabled" so that you can still boot from recovery media like a CD or USB drive. Installing Win10 onto an MBR drive includes some hidden partition info to help the BIOS (not UEFI) find the boot圆5.efi file that will in turn fire up the Win10 bootmgr and winloader. (FYI, I'm running Win10.19045 on an AsRock B450M Steel Legend with AMIBIOS 3.30) this is one of those "onion" problems that involves how you originally installed windows, how you did your GPT conversion and the UEFI options set for your mobo. Update: Turns out CSM is the option which decides boot mode. PS:- If I don't change boot mode to UEFI after converting disk to GPT, windows won't boot apparently, which I would like to avoid at any cost. How do I change the boot mode to UEFI after the disk conversion, or is there no need for me change the boot mode at all?(The disk conversion from MBR to GPT using the tool is a non-destructive process) The only things I have under Boot which are of some importance areīoot Option priorities(with only 1 option being the SSD containing windows) andĬSM - enabled (under which all other settings are already set to UEFI only by default I have to change the boot mode from legacy to UEFI in BIOS after the conversion to GPT.īut I don't have any option called "Boot Mode" in my BIOS settings under the Boot section. I know I have to convert the disk containing OS into GPT format, planned to use the mbr2gpt.exe from windows. Solved the TPM 2.0, but stuck at the UFEI firmware requirement. So, I'm trying to make my system win 11 compatible. BIOS version: P3.20 - AMD AGESA Combo-AM4 1.0.0.3(shows this when checked using CPU-Z)
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