How to Erase All Data On iOS
You can remove all settings from your iPhone, iPod touch and iPad tapping Erase All Content and Settings, using Settings – General – Reset – Erase all Content and settings. This procedure will wipe all settings and content from your device.
Before removing all settings and information ensure that you have an iCloud or iTunes backup and that it is up to date, just in case you wish to recover the data again.
When you select to Erase All Content and Settings the process can take from a few minutes to several hours. The time will vary by iOS device.
While erasing data, your device displays the Apple logo and a progress bar on its screen.
In devices that support hardware encryption, the process erases all data by removing the encryption key that protects the data. This process is fast and takes just a few minutes. (In fact, all devices that support iOS 5 and later use hardware encryption).
However in those devices that overwrite memory, the process overwrites user settings and information, writing a series of ones to the data partition. This process can take several hours. In fact it depends on the storage capacity of your iPhone or iPod touch.
Don’t forget to connect your device to a charger and leave it connected until the process is complete. But if you run out of power or reset your device before it is complete, you will see the Connect to iTunes screen after you connect to power again. If this happens and you want to ensure that your content is fully erased, you must restore the device using iTunes. If your iPhone wasn’t able to remove all the settings and data due to some technical issues, select Erase All Content and Settings option again.
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