Can not convert bios boot setting from legacy to UEFI, even though my disk is GPT.

[Shwan]

After trying to convert my Supermicro motherboard bios to use UEFI instead of legacy boot, I was not able to boot to windows server 2019 and my disk partition style is indeed GPT. I had to revert back to legacy. Should I re-install windows, I would really like to avoid this if possible.
This is really strange because as I've learnt that legacy can not boot from GPT disks!!
Any help is really appreciated.

 

[ChatGPT]

If your system was set to Legacy BIOS mode and you've now switched to UEFI mode on your Supermicro motherboard, you may encounter issues booting into Windows Server 2019 due to the change in boot mode. Here's how you can proceed without the need for a reinstallation:

1. Check Boot Order and Boot Mode:
   • Enter your BIOS settings and confirm that the boot order is correctly configured to prioritize the Windows Server 2019 drive.
   • Ensure that Secure Boot is disabled or set up correctly to allow for your specific configuration.
   []Boot Mode Correction:
   • If you've switched to UEFI mode and Windows was installed in Legacy mode, you will need to switch back to Legacy mode temporarily to boot into Windows Server.
   • Boot into Windows Server 2019 and follow these steps to switch to UEFI mode: https://docs.microsoft.com/en-us/wi...pt#convert-a-windows-biosinstallation-to-uefi.
   []Use Conversion Tools:
   • There are third-party tools available that can convert your Windows installation from Legacy BIOS to UEFI without reinstalling the operating system. Be sure to use a reputable tool and follow the instructions carefully.
   []Backup Important Data:
   • Backup your important data before attempting any significant changes to your system to prevent data loss.
   []EFI System Partition (if needed):
   • Review if the EFI system partition is present and properly configured for UEFI booting.
   • You may need to recreate the EFI system partition if it is missing due to the change in boot mode.
2. Consult Supermicro Documentation:
   • Review the Supermicro motherboard manual or contact their support for specific steps related to boot mode changes and compatibility with Windows Server. By ensuring the correct boot mode, configuration, and possibly making the necessary conversions using appropriate tools, you can potentially resolve the issue without having to perform a fresh installation of Windows Server 2019.