[SOLVED] Can I change Bios from legacy to UEFI without loosing Data?

Sep 16, 2021
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My other machines are also Dells and running on UEFI they all have the same BIOS, so it should work.
I have not reinstalled Windows when I got It - Which is not famous! 😞
 

Charseza

Honorable
May 26, 2015
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It's possible.

Use mbr2gpt.
https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt

But before you use it, make sure your system supports UEFI.
If it doesn't, then you'll be screwed big time. No easy way for reverting back.

Only restore from backup or use of advanced 3rd party partition management tools and manual bootloader recreration.
This is the answer the OP is looking for. Ive personally done this, and if you do it correctly it should be an easy transition
 

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