Resetting your device
You can reset your device to its original settings, with or without deleting all of your
personal data. Before you perform a reset, make sure to back up any important data
saved on your device.
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To perform a factory data reset
To avoid permanent damage to your device, do not restart your device while a reset procedure
Drag the status bar downwards, then tap .
Find and tap Backup & reset> Factory data reset.
If you also want to erase data such as pictures and music, which is saved to your
device's internal storage, mark the Erase internal storage checkbox.
Tap Reset phone.
To confirm, tap Erase everything.