Setting iPhone se to factory settings
How do I set iPhone se to factory settings
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Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings
"A factory restore erases the information and settings on your iPhone, iPad, or iPod and installs the latest version of iOS or iPod software."
http://support.apple.com/HT201252
How to erase your iPhone, iPad, or iPod touch
"Learn how to wipe information from your iPhone, iPad, or iPod touch and restore your device to factory settings." Without using iTunes. Does not reinstall iOS.