A factory data reset may help with a blank or frozen screen, apps crashing or freezing, keypad/touchscreen problems, can't hear, device making noises, can't make or receive calls, and device won't sync.
Perform a factory data reset only if absolutely necessary as it removes all settings and data including:
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Contacts
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Email accounts
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System and app data
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App settings
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Downloaded apps
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Media (It is recommended to backup this data)
Alternatively, music, pictures and videos can be backed up to a computer.
Notes:
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From a Home screen, tap Apps (located at the bottom).
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Tap Settings.
If the app icon is missing, tap App menu filter (located at the top) then tap All apps.
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Tap Privacy.
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Tap Factory Data Reset.
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Ensure Erase internal storage is selected (checked) then tap Reset phone.
If presented, enter the current passcode or draw the unlock pattern.
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Tap Erase Everything.
Allow up to 10 minutes for the factory data reset and reboot processes to complete.
If applicable, set up your device.
Related Topic:
Factory Data Reset