Fix BitLocker Blank Screen After BIOS Update - How to Resolve Port Already Allocated in Windows Security-Windows Defender Version Mismatch Troubleshooting Checklist

Updated 2026-06-14 12:01:00office-tools
Fix BitLocker Blank Screen After BIOS Update - How to Resolve Port Already Allocated in Windows Security-Windows Defender Version Mismatch Troubleshooting Checklist
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.