Android Google Account Manager 601 Link Guide

: Ensure your device is set to "Set time automatically." Incorrect dates will cause Google's security certificates to fail. Clear Play Services Cache Settings > Apps > Google Play Services > Storage and select Clear Cache Enable Unknown Sources

Because the problem is in the /system partition, which a factory reset does not touch. You need to reflash the ROM or manually replace the Account Manager APK. android google account manager 601 link

This is the safest and most effective solution. It uses Google’s own servers and your device settings. : Ensure your device is set to "Set time automatically