if you put your phone into boot loader (look up on youtube if you don't know) and go down to recovery mode using the volume up and the volume down buttons and hit the power button on it your phone should be in a black screen for 5 - 10 seconds then an android will a red charge or red battery will pop up (don't worry that doesn't mean you have low battery) hold down the power button and the volume up, after that you should into another different screen scroll down using the volume down button and hit the power button on wipe cache partition (don't worry it does not break your phone or do anything bad all it does is stores temporary system data it's supposed to allow the system to access apps more quickly and efficiently but sometimes things get cluttered and outdated so a periodic cache clearing can help make the system run more smoothly if you don't believe me you can google it "what does wipe cache partition mean?" after you do that it should pop up with the same screen as last time and it should say reboot system now all you do is press the power button and it should reboot your phone and after test if it works if not do it again if still not working please feel free to ask me for more help (i did copy and paste what wiping cache partition mean because i forgot it at the time.