hey i m using j7 duo purchased in 10 days before facing a problem that application cant be lock in my phone. Plz tell me suitable solution

my phone was running good before updation bt i m actually in problm after updation in f**king 7.1 it s**ks battery and talking long time to charge it.....anyone have a solution of this problm so give me review guyss ...i knw u all are awesome mechani...

tell me about to root c9 pro indian mobile phone