For me, 1 out of every 5 cloned drive (mechanical to SSD) fails to successfully boot. Most common error codes are C1, C21a, C7, etc, all indicating missing, damaged, or inaccessable boot files. Rarely it is just a Black Screen, but it does happen. This happens because the Cloned BCD files are pointing to a DRIVE and Partition that no longer exists. So the BCD files have to be corrected to point to the new drive and partition.

This tutorial applied Windows 10/11 and validate up to 1-17-2024. Microsoft can change anything they want at anytime without warning. Afterall, YOU DO NOT OWN WINDOWS. Again, this is how I fix the error, and it is meant a a guide for you. You will have to make adjustments to the steps provided for the individual computer you are working on. I.E. the Windows folder maybe located on the D:\ drive and not C:\ drive.

This is not a promise or guarantee it will fix your problem, nor am I resposible for any damage or loss of data. This is a tutorial on how I resolve the problem when I encounter them. You are assuming all the risks.

This recording of my TikTok Live dated 01-16-2024 demostrated how I usually repair this problem.

Below are are the Command Prompt command I use.
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Diskpart
list vol

**** select the FAT32 vol or the 260mB-500mb vol (EFI Hidden vol)
Sel vol ?
assign letter=t:
exit

cd t:\efi\microsoft\boot
attrib bootmgr.* -h -s -a
ren t:\efi\microsoft\boot\bcd bcd.old
bcdboot c:\Windows /l en-us /s t:\Boot /f All

==================== alternative ====================
format t: /FS:FAT32
bcdboot c:\windows /s t: /f UEFI

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd

md c:\Scratch
DISM /Image:c:\ /ScratchDir:c:\Scratch /Cleanup-Image /RevertPendingActions
DISM /Image:c:\ /ScratchDir:c:\Scratch /Cleanup-Image /Restorehealth

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos

sfc /scannow
chkdsk /f /r

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