Restore Windows EFI boot entry

I experienced a SSD failure this Monday, both my root volume and /home was lost, I had to do a full reinstall and backup restore. Duplicity saved me once again, I had a daily backup of my home, unfortunately it was a full Fedora 32 reinstall.

Anyway, with the data I also lost the ESP parition where I had Windows bootloader. While Fedora Linux works fine, I am unable to boot my Windows where I have few things for fun, mostly games and audio production software. Here is a trick how to easily restore the Windows EFI boot entry in grub.

Download a Windows 10 installation ISO, dd it to an USB stick, boot it, press a key and on the welcome screen press SHIFT-F10. In a command prompt, make sure it detected Windows installation as C: and type “bcdedit C:\WINDOWS”.

Reboot into Linux and rewrite grub configuration. For Fedora it’s:

grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

It should print something like “Found Windows” blah blah. You are done.

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