the iphone could not be updated. an unknown error occurred 100
the iphone could not be updated. an unknown error occurred 100. What does this error mean?
iPhone SE, iOS 13
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Apple does not provide any documentation for Error 100, whatever that might be.
Power off your iPhone, wait a minute, then power it back up.
Try to run the update again
Remember that you will need a good strong Wi-Fi Internet connection and the iPhone battery must be charged to at least 50% or more. If you have Low Power Mode turned on, turn it off.
You cannot update using a cellular connection or a hotspot connection.
More suggestions here:
If your iPhone or iPad won't update - Apple SupportOfficial Apple Support › en-us
If all else fails, sometimes connecting the iPhone to a computer will allow the update to occur.
If still no luck, take the phone to the Apple Store or an authorized Apple Service shop