必应池
Home / office-tools / How to Add a Bluetooth Device in Windows 11 - Fix Windows 11 Installation Assistant Stuck at 99% in Safe Mode-How to Resolve Cloudflare 521 from Server Overload

How to Add a Bluetooth Device in Windows 11 - Fix Windows 11 Installation Assistant Stuck at 99% in Safe Mode-How to Resolve Cloudflare 521 from Server Overload

2026-07-28 09:33:00office-tools
How to Add a Bluetooth Device in Windows 11 - Fix Windows 11 Installation Assistant Stuck at 99% in Safe Mode-How to Resolve Cloudflare 521 from Server Overload

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.