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All replies
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Helpful answers
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Sep 24, 2016 3:35 PM in response to jonasmartinby ChrisJ4203,Yes, restore the device to factory. Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support
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Sep 24, 2016 3:35 PM in response to jonasmartinby sberman,Settings > General > Reset > Erase All Content and Settings
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Sep 24, 2016 4:05 PM in response to ChrisJ4203by jonasmartin,★HelpfulThe "restore to factory" option does not overwrite stored data, but merely deletes the operating system's decryption key. Do you know of any way to permanently overwrite stored data instead?
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Sep 24, 2016 4:07 PM in response to jonasmartinby ChrisJ4203,Restore to factory wipes the device and installs a new copy of the operating system. I'm not aware of anything that writes over the device again. The data is encrypted to start with, so even if someone was able to recover it, it would not be readable.
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Sep 24, 2016 4:15 PM in response to jonasmartinby sberman,The iPhone User Guide explains that Settings > General > Reset > Erase All Content and Settings does indeed erase the iPhone.