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Unfortunately you will have to perform a factory reset of the device. This is the ONLY way to get access to the phone again.
As long as you have a Google account synced to your device, your contacts, calendar, etc. will be re-synced to the device after you run the initial setup again. As far as any data that is stored on the SD Card(images, music, etc.), it will not be erased. Only the phones internal memory is formatted.To complete a Factory Reset follow these directions:
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