How to factory reset your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/108931
How to factory reset your iPhone, iPad, or iPod touch Back up your device Make sure to back up your device so that you can restore your data later. Tap Settings > General > Transfer or Reset [Device] Tap Erase All Content and Settings. If asked, enter your passcode or Apple ID password Forgot your passcode or Apple ID password? Confirm that you want to erase your device ... Wait for your device to erase ...
Back up your device Make sure to back up your device so that you can restore your data later.
Tap Settings > General > Transfer or Reset [Device] Tap Erase All Content and Settings.
If asked, enter your passcode or Apple ID password Forgot your passcode or Apple ID password?
Confirm that you want to erase your device ...
Wait for your device to erase ...
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