Update IOS TO 16 for iPhone 8+
iPhone 8 Plus, iOS 15
Connect to a WiFi network.
Disable or remove the VPN service.
Charge the battery and preferably leave it connected to the charging circuit during the update process.
Attempt the update again.
2 replies
Turn off VPN. Better yet, delete it.
Charge the phone to at least 60% and leave the power adapter connected
Turn on Wi-Fi and locate the phone close to your Wi-Fi router
Update IOS TO 16 for iPhone 8+