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Power cycle the device by holding the Power button for 20 seconds, 5 times. Attempt to start the phone by holding down the Power button along with the Volume down button to start recovery mode and performing a factory reset. If these do not solve your problem, Please follow these steps:
1) Let your phone rest for 12 hours (do not charge);2) Charge with the official charger and usb for 6hrs;3) After 6hrs disconnect then reconnect your phone to the charger, a low battery screen should appear;4) Do not attempt to boot. Allow it charge for 1 more hour;5) After 1 hour, your device should be ready to boot and power-on.