Transitioning from CSM assistance to Secure Boot implementation
Transitioning from CSM assistance to Secure Boot implementation
I possess an NVME M.2 as my Windows 10 storage. It functions normally with the current setup, but when I turn off CSM support and switch to secure boot, it fails to boot or appears as an option, yet it still works in BIOS. I attempted to convert the drive to GPT, which required a long night of troubleshooting and recovery. I prefer not to reinstall Windows, but secure boot is essential for upgrading to Windows 11. After a recent installation of Windows 10 with secure boot, it worked perfectly, following the drive conversion issue. Now I’m back to MBR and have a functional Windows 10, but I’m unsure how to proceed.
This seems a bit confusing. With MBR you need CSM first, then secure boot isn't possible. Why did you revert back to MBR?
Due to Secure Boot requirements, I needed Windows 11 with GPT but faced issues booting from my NVME M.2 drive. After converting to GPT, legacy and UEFI settings blocked startup. I installed Windows 10 on the NVME with Secure Boot to check if the problem was hardware-related. Since I restored the drive to MBR during cloning, it worked initially. To resolve this, I aim to update the MBR to GPT with Secure Boot support while preserving data. I attempted this as described in my earlier post but encountered failure.
The straightforward response is: you can't, you must use a GPT drive to install Secure boot/EFI Windows. You did the work but then broke it for some mysterious reason.
Hello VsUK, I’m ready to assist with converting your Windows Boot Drive from MBR to GPT and enabling TPM 2.0 & Secure Boot for Windows 11. This process won’t require reinstalling the operating system. Converting MBR to GPT: Step 1: Start by booting into the Windows Recovery Environment—press Shift during restart. Step 2: After entering, select Troubleshoot and then Advanced Options. Step 3: Open the Command Prompt. Step 4: Enter the command mbr2gpt /validate. If successful, proceed to mbr2gpt /convert. Step 5: Once conversion completes, update your BIOS from CSM to UEFI before proceeding. Step 6: Reboot using the command prompt: shutdown /r, then input your BIOS key at startup (common key is Delete). Step 7: In your BIOS settings, switch from CSM to UEFI and save the changes. Note: The exact location of these BIOS settings varies by motherboard brand—MSI or Asus may have different paths. Reminder: Do not turn TPM and Secure Boot on simultaneously; restart between these changes.