Windows 10: Messed up bootloader/BIOS/UEFI

Hello.

I had Debian installed. Yesterday I installed Windows because I needed it for a program. Windows killed my GRUB. I reinstalled GRUB and accidentally removed the windows bootloader?.

GRUB won't recognize that a bootloader is in /dev/nvme0n1p2. And If I boot and press F12, there is only one single item: My GRUB-Bootloader.

How can I add windows to the bootmenu, that shows up when pressing F10?

submitted by /u/StayPrivate__
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:)

 

UEFI / Legacy BIOS Mess and Windows Update

And I suggested another way that can be much faster.

 

UEFI / Legacy BIOS Mess and Windows Update

@NavyLCDR suggested just that, and gave instructions on how to do it using Macrium.

UEFI / Legacy BIOS Mess and Windows Update

IMO, that is the best way forward for the OP.

 

How To Fix The Windows 10 Bootloader

THANK YOU. This solved it. I think this was mentioned earlier by you or someone else perhaps but I've messed around with it enough now where I vaguely understood what the commands were doing. I actually had to delete the partition, recreate it, and re write the BCD as you suggested in Step 3.

Shoutout to @topgundcp I'm sure that last method you suggested would have worked too, but now I understand how to do it manually, so I learned something.

Also, thank you @NavyLCDR for your help as well.

I have ONE last question, any SAFE way to remove the old ubuntu EFI entries that are present in my UEFI as boot options?

edit: Nvm, figured it out. For anyone else wanting to know how to remove old EFI boot entries, use "EasyUEFI" it is super easy. Took like 10 seconds after install. I DID have two identical looking EFI's for my samsung ssd, one of them, in the details, showed that it had no file path. I assumed that was my old broken one and deleted it, must have been correct bc my computer boots up perfect.

Thanks!!!