1. Download stock rom here:
Version 12.8.10.56
https://drive.google.com/file/d/0B2oMRhweQ4CHWlBPMk1LNVJ6OEU/view?usp=sharing
Save it into your internal memory.
2. Turn of your phone and switch to Twrp recovery. Volume down and power button press and hold at the same time.
3. In Twrp recovery, tap wipe, then choose data, system, cache and dalvik. Back to main then tap Install and find your downloaded file and flash it. After flashing reboot your phone and your done.
Note: this tutorial can fix bootloop and return to its original system.
Version 12.8.10.56
https://drive.google.com/file/d/0B2oMRhweQ4CHWlBPMk1LNVJ6OEU/view?usp=sharing
Save it into your internal memory.
2. Turn of your phone and switch to Twrp recovery. Volume down and power button press and hold at the same time.
3. In Twrp recovery, tap wipe, then choose data, system, cache and dalvik. Back to main then tap Install and find your downloaded file and flash it. After flashing reboot your phone and your done.
Note: this tutorial can fix bootloop and return to its original system.