Is absolutely essential to understand very well that your phone may be a need to re-adjust the factory first and before you decide whether the need to go to maintenance engineers through specialists or not.
Indeed most of the phones when they are factory reset resume work quite well as like the first time that the phone operates, for this we recommend that your phone is full battery and has shipped at least 80% of the battery capacity, and then rebuild the factory settings through the following steps.
How to Hard Reset Huawei G6600 Passport
Reset Via Master key
Start by turning your handset on, to do it press Power button.
Then dialling screen of your device type this code in dialer: ##258741
Next on confirm whole Factory reset process by tapping Call key again.
Now your phone should reboot.