This report outlines standard recovery procedures for Windows Server 2012 R2
To verify drive letters:
Most boot repairs require you to access the recovery tools. If the server cannot boot to the OS, follow these steps: windows server 2012 r2 boot repair
For virtual servers (Hyper-V, VMware):
Disable dynamic memory or integration services temporarily, as these can cause boot loops.
Critical Note: Before attempting any repair, if your data is not backed up, consider removing the hard drive and connecting it to another system to copy critical data. Boot repair tools modify system partitions and can, in worst-case scenarios, lead to data loss. Boot repair tools modify system partitions and can,
Warning: Only use this method if the regback folder contains recent, known-good copies.
Alternative (if /rebuildbcd fails): If the BCD store is beyond repair, you must rename the old BCD and create a new one: in worst-case scenarios
Rebuild the BCD: