Plz help ....i updated my lumia 520 to winodws 8.1 now my battery drains fastly i only yse whatsapp and messenger my battery will finish in 3 hrs means in 30 minutes its consumes 15 to 20 % ...i have done hard rsset many times in my device but no changes but in windows 8 my device gives me a full day backup ...i also buy new battery but no new change ...only 1hrs battery backup increase what i do ...with no use its consume 10 percent baatery in 25 min... i use nsu for downgarde but using of nsu no changes happen nsu again installed windows8.1 and not downgrade to windows 8 i want to downgrade my lumia 520 to windows 8....how i do ...plz frnds help me ....
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