How to perform BMR of EFI/UEFI machine to legacy BIOS boot machine / Hyper-V Gen 1 (4040939)

Restores or exports cannot be performed directly to legacy BIOS servers or Hyper-V Generation 1 server as the automatic restore mapping will be still create the disk as GPT partitioning.

Also specifically, 2008 R2 EFI original servers also cannot be exported or BMR to Hyper-V as 2008 R2 is not supported in Hyper-V Generation 2 and EFI is not supported in Hyper-V Generation 1.

A conversion to MBR partitioning is required for the BMR to be successful in this case.

1. During restore of the drives, please use "Manual Mapping" for the restore. Do not use "Automatic Mapping" as it will wipe the disk and recreate the disk as GPT as the original disk.
2. Perform restore on the C partition only mapped to the partition we have created in the first part. Restoring EFI partition is not needed.
3. After restore is complete, please go through diskpart again to active the partition again.
4. Please inject drivers required in "Existing Windows Driver Manager" to the restored partition.
5. Click Repair Boot Problems to repair the boot records.
6. Perform a reboot and check if the server is booting up.

If the server is not booting up correctly with black screen/MBR issues, please continue to the third part to perform boot repair using the OS CD/DVD.

Third part, OS CD/DVD Repair (Please use the same OS CD/DVD as the original OS to perform the repair)

1. After CD/DVD boot up, please click on repair installation, and select the disk containing your OS.
2. Open the command line
3. C:
4. bootrec /fixmbr
5. bootrec /fixboot
6. bootrec /rebuildbcd
7. bootrec /scanos
8. bcdboot C:\Windows
9. If the restore target is Hyper-V, please refer to this KB to perform the registry changes https://support.quest.com/kb/128954
10. Perform a reboot and check if the server is booting up.