You can follow the steps below to perform a factory reset of your phone.
Please note that this will wipe any user data currently stored on the handset, so we strongly suggest backing your phone up first.
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Turn off the phone.
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Hold the 'Power' + 'Volume Down' buttons.
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When the phone vibrates, let go of the power button only (keep 'Volume Down' held).
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Use the 'Volume Down' button to scroll down to 'Wipe Data/Factory Reset' and use the 'Power' button to select this option.
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Use the 'Volume Down' button to scroll down to the 'Yes' option and use the 'Power' button to select this.
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Use the 'Power' button to select 'Reboot System Now'.
This will complete the reset procedure.