DON'T USE OTA IT COULD BRICK YOUR DEVICE …. SO PLS ALWAYS DOWNLOAD FROM HERE (IF YOU ARE ON 6.7.14 THEN YOU CAN DIRECTLY FLASH IT WITHOUT WIPING LIKE OTA.
Instruction:
1. Go to TWRP
2. Wipe > Advance Wipe > Dalvik / ART Cache & System & Cache & Data (For fresh Install, ignore if updating from...