Troubleshooting
Fix: Windows Recovery Environment (WinRE) Won't Open in Windows 10
Troubleshoot Windows 10 when Advanced startup or Windows Recovery Environment will not open, using supported WinRE checks and recovery media.
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winre
3 articles
Troubleshooting
Fix Windows Boot Error 0xc0000225 in Windows 10 or 8.1
Troubleshoot boot error 0xc0000225 with Startup Repair first, then repair Boot Configuration Data only when needed.
Windows guides
How to Rebuild the BCD in Windows 10 or Windows 8.1
Repair Boot Configuration Data from Windows Recovery Environment, using Startup Repair first and Bootrec or BCDBoot only when needed.