If the error persists across all apps and browsers, your OS installation is likely corrupted. Since Windows Phone is a closed ecosystem, you cannot repair system files manually; you must re-flash the OS.
Microsoft released a critical root certificate update for Windows Phone 8.1. Installing it often resolves error 800c0005. error code 800c0005 windows phone
The error code 800c0005 on Windows Phone can occur due to several reasons, including: If the error persists across all apps and
If you are seeing this error today while trying to: you cannot repair system files manually