Knowledge base for software setup, errors, and daily tool work.

Avoid Windows Activation Version Mismatch on Reinstall

You reinstall Windows, enter your product key, and get an error: “This product key does not match...

Fix Windows Update Token Expired Error 0x80070057

You see error code 0x80070057 when trying to run Windows Update, often with a message about a tok...

Fix WireGuard Handshake Not Completing on Android

If you see 'Handshake did not complete' in the WireGuard Android app, the tunnel can't establish ...

How to Fix Windows Update Service Unavailable Error

If you see 'Windows Update service unavailable' when trying to check for updates, the Windows Upd...

Windows Defender 502 Bad Gateway: Troubleshooting Checklist

If you see a 502 Bad Gateway error when opening Windows Security or trying to update Windows Defe...

Fix GitHub Actions Cache Action Permission Denied Error