After cloning a SSD for a customer it wouldn’t boot after running the normal

Bootrec /fixmbr

Bootrec /fixboot

Bootrec /scanos

Bootrec /rebuildbcd

But the Bootrec /rebuildbcd wouldn’t work with a error  “The requested system device cannot be found”

after spending time looking in to this issue i found a  forum post that fixed it right up.

Firstly, boot from a UEFI Windows 8/10 recovery disk (CD/DVD/USB) – I found that the automated recovery process didn’t find the correct Windows partition, nor when I managed to add it to BCD settings would it make it reliably bootable e.g. using BCDEDIT I got it to find and launch the Windows partition but it refused to cold boot or would not “keep” the settings after a 2nd reboot or power off.

Go into the Advanced options and run the Command Prompt.

Enterdiskpartto use the DiskPart tool to ensure you have all the right partitions and to identify your EFI partition – the key thing here is that your EFI partition is formatted as FAT32:

DISKPART> sel disk 0

Disk 0 is now the selected disk.

DISKPART> list vol

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     E                       DVD-ROM         0 B  No Media
  Volume 1     C                NTFS   Partition    195 GB  Healthy    Boot
  Volume 2         WINRE        NTFS   Partition    400 MB  Healthy    Hidden
  Volume 3                      FAT32  Partition    260 MB  Healthy    System

Then assign a drive letter to the EFI partition:

DISKPART> sel vol 3

Volume 3 is the selected volume.

DISKPART> assign letter=b:

DiskPart successfully assigned the drive letter or mount point.

Exit DiskPart tool by enteringexitand at the command prompt run the following:

cd /d b:\EFI\Microsoft\Boot\

bootrec /fixboot

Delete or rename the BCD file:

ren BCD BCD.bak

Usebcdboot.exeto recreate BCD store:

bcdboot c:\Windows /l en-gb /s b: /f ALL

The/f ALLparameter updates the BIOS settings including UEFI firmware/NVRAM,/l en-gbis to localise for UK/GB locale. The localisation defaults to US English, or use en-US.

Reboot and cross your fingers.

Source http://superuser.com/questions/460762/how-can-i-repair-the-windows-8-efi-bootloader