HT204770: Get help with iOS update and restore errors
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Q: iPhone backup error - not enough space
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Sep 25, 2016 11:05 PMby Ingo2711,You can connect to iTunes and update the iOS, which will not require that much free space on your phone as the Wi-Fi update process will, approx. 2GB.
To find out about your free space, go to Settings/General/About.
To use iTunes, follow the steps in this article, don't forget to backup your phone before you start.
Use iTunes to restore your iOS device to factory settings - Apple Support
