Before Huawei Ascend P7 hard reset, ensure the device is charged to a minimum of 50%. If you try to hard reset your smartphone with a critical amount of charge it may not turn on after the reboot. System updates can bring improvements that could fix your issue.
Android Factory Reset Protection (FRP) is a new feature in some of the device with Android OS 5.1 or higher. FRP prevents from other people using your HUAWEI Ascend P7 and performing a factory reset without your permission. Factory reset in that case is only possible with access to your Google Account and screen lock information. Factory data reset on HUAWEI Ascend P7 deletes the addresses of all of your data but does not overwrites it. That way the device does not longer know where exactly the data is stored. There are ways to recover it. pro4kx.