This wipes all data on the phone.
: Microsoft has officially ended support for Windows 10 Mobile and Windows Phone 8.1. Incorrect Date and Time : The most common "fixable" cause. error code 800c0005 windows phone
For tech enthusiasts, the only remaining "fix" is often the device or installing custom ROMs (like the "Windows on ARM" project for Lumia 950 XL). However, for the average user, this error usually signals that it is time to transition your data to an Android or iOS device. This wipes all data on the phone
: The device’s internal "keys" to the internet are outdated. for the average user
Try the following solutions in order. Most users will find success with Solution 1 or 2.