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Rebooting i Phone is a proven way to solve almost 70% of the issues faced by the users including i Phone frozen during the update.
Restoring with i Tunes is another fix you can try to get your issue resolved.
If you are using i Phone 8 or later, press the Volume Up button once quickly and then Volume Down button.
Keep holding the Side button until your i Phone restart and you can see the Apple logo.
Maybe your device’s battery wasn’t fully charged when the upgrade process began, or the upgrade process ran the battery down or quite simply a faulty battery. Now that we have knocked off battery as a potential culprit, the next step is to try a hard reset to see if the problem was just i OS crash.
Many issues can result in your device’s battery quickly running out absent your knowledge.
For this to work, your device will have to be functional, that is, no hardware issues (we’ll get to that soon). You can restore from the just completed backup, or select an earlier backup. The hardest part is the waiting part – waiting to see if it works. This method is for those who have made a prior backup of their device before i OS upgrade issues, as this method will wipe every settings and contents off of your device. Connect your lightning connector to your device – just your device. Connect your device to your computer while pressing down the “Home” button of your device. And the root cause of performance related issues on the i Pad/i Phone devices are: To fix frozen/lagged i Phone, you can use the free feature of the i My Fone Umate i Phone Cleaner to clear junk files from your device.