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Converting mbr to gpt failed for Win10 laptop
I have an old Dell Latitude laptop that a relative gave me, rather than thowing it out, and it was running Windows 7. So, I upgraded it to Windows 10 -- a couple of years ago -- and it's been working fine since. It's now running 19045.3636 Pro.
But only recently, I was scrolling through its BIOS settings and discovered that it can boot using UEFI, so I set about to convert my MBR, legacy boot Win10 to GPT, UEFI boot. I read this was a simple process using mbr2gpt.
I ran mbr2gpt validate -- and got no errors, so I ran mbr2gpt convert -- and it worked OK (conversion completed successfully), but it ended with the following message:
Failed to update ReAgent.xml, please try to manually disable and enable WinRE.
So I ran reagentc /disable -- and got:
Windows RE is already disabled.
So, I rean reagentc /enable -- and got:
Unable to update boot configuration data.
When I reboot the Dell, I get the error:
No bootable devices
I have a desktop that runs both Win 11 and Win 10, and with a dock, I can access the laptop's SSD to do any file changes.
Yeah, I know I could clear the drive and reinstall Win10 from scratch -- but I am trying to get this conversion to work without having to resort to that.
So, what can I do to repair the boot?