Note: If you’re restoring a DC without FSMO roles, you may want to transfer them to it manually after the restore, using the ntdsutil seize command.
If the first DC that was restored is already hosting operations master roles, set the following registry value in order to bypass initial synchronization requirements and not to wait for another partner to replicate the directory partitions:
Key Location: HKLM\System\CurrentControlSet\Services\NTDS\Parameters
Value Name: Repl Perform Initial Synchronizations
Value Type: DWORD (32-Bit) Value
Value Data: 0
After setting the value above, restart the domain controller.
Note: Don’t forget to reset this value back to 1 after domain recovery is completed, so that the domain controller requires successful replication with its partners before starting to service client requests.