> On 6 Nov 2021, at 18:12, Matthew Saltzman <m...@clemson.edu> wrote:
> 
> I have a Lenovo Yoga X1 (2nd generation), on which I was happily
> running a dual boot of the original Windows 10 installation that came
> with the machine and Fedora 34, which I had upgraded through a few
> versions of Fedora.
> 
> This time, I decided to do a fresh install of Fedora 35 (to try out
> BTRFS), but when the installation finished, there was no option to boot
> Windows. The Windows data partition, Microsoft reserved partition, and
> recovery partitions are all still in place. I attempted to use grub-
> customizer to add a chainloader entry pointing to the Windows, but it
> displays "Error building boot sequence. Check parameters!"
> 
> Gparted shows the Windows partition and the EFI partitio both have
> bootable and esp flags set.
> 
> Thanks in advance!
> 
> How can I get my Windows system to be accessible again?

I think this is what you are looking for:

https://unix.stackexchange.com/questions/512253/modify-grub-to-dual-boot-fedora-with-windows-10

Also if you reboot and hit the key for the BIOS boot menu you should see 
windows listed.

Barry



> -- 
> Matthew Saltzman
> School of Mathematical and Statistical Sciences
> Clemson University
> mjs AT clemson DOT edu
> 
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