Some time different issue into device which one hang on logo, restarting issue, pattern lock, display lock etc so how to solve that ? bu don't worry if you have this type problem in this device then you can use this tutorial but some impotent for that first of full carefully read tutorial after you can following this tutorial because you can do easy done without any issue or error.
This flash file tested by me without any error working well, you can use this flash file when your device hang on logo problem, restarting problem, security lock problem, password lock problem, pattern lock problem etc software related problem and you can use this tutorial without any box and this is free for all who know about software in mobile, impotent for flashing first must check your micro usb cable if not good then you can't flash it so check micro usb cable second check your device battery that is impotent for flashing if your device battery low so stop your device between flash so this is impotent for flash, before you flash save your data like contact, photos, videos etc because this is factory flash file so you can't save after full flash so must remember all are impotent notes.
1. Take tested firmware or flash tool from above link (if link not working just write down comment on below comment box)
2. Extract to desktop or as you like path (must installed winrar software in your computer or laptop if not installed winrar then you can't open firmware)
6. Press and hold Volume Up button and insert usb cable (must be working well device key or micro usb cable)
7. Wait until driver install, if driver installed in your computer or laptop then downloading automatically start in to device