How to Hard Reset on Sony SGP771 Xperia Z4 Tablet LTE-A?

  1. Install the flashtool from Sony website http://developer.sonymobile.com/services/flash-tool/.

    Hard Reset keys Sony SGP771 Xperia Z4 Tablet LTE-A

  2. You should have drivers for USB data cable.
  3. Power off the device.
  4. Hold down the Volume Down key and connect device using the USB cable.
  5. Follow the instructions on the display to complete the process.
  6. That's all! After these actions, your device data will be deleted. 

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