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  power off the phone press and holdVOLUME UP + POWER ON BUTTON screen show android logo THEN PRESS POWER ON BUTTON screen show recovery manu THEN PRESS VOLUME DOWN BUTTON AND SELECT WIPE DATA RESET NOW PRESS VOLUME UP BUTTON screen show delet all user data NOW PRESS VOLUME DOWN BUTTON and select delet all user data NOW PRESS VOLUME UP BUTTON  

Hold Power Sowitch & Vol Down Long 10-12 Sen After Show This 1-reboot system now 2-apply update from adb 3-apply update from sdcard 4-apply update from cache 5-wipe data/factory reset 6- backup user data 7-restore user data Auto select down & Stop step 5 after click vol+ Now your Mobile is full reseted reboot system now and enjoy it 10000000000% tested by Ibrahim