Windows: Boot

For some reason you might find that you can't boot into Windows.

If this happens, you may need to re-write the Windows System partition. Here's how to do it.

*** WARNING use these steps at your own risk ***

*** These steps may irreversibly damage your computer ***

Try https://www.thewindowsclub.com/rebuild-bcd-windows-10 first.

Otherwise below are the manual steps for advanced users.

1. Get into the WIndows Recovery Environment:

2. Choose Troubleshoot > Command Prompt.

3. If you have Bitlocker, enter your Bitlocker Recovery Key.

4. In command prompt, try typing:

c:

dir

5. If you recognise the contents (it should have a Windows directory there) then this is your hard drive.

6. Type the following:

diskpart

list disk

7. Take a note of the disks available. If there is more than 1 disk, check the disk space size. Or power off your computer and disconnect all other disks apart from the disk that you know contains your hard drive then start from step 1 again.

8. Type the following (where X is the number of your disk):

select disk X

list partition

9. Take a note of the partition that is called "System".

10. Type the following (where Y is the number of the System partition):

select partition Y

assign letter = S

exit

11. Now type the following command to restore the default boot partition:

bcdboot c:\windows /s S: /f UEFI