First Download ROM and Save it to Root Directory (link below)
1. Go to Play Store and Download Official TWRP app
2. Download recovery.img (link below) and Flash Using TWRP app
3. Completely Switch Off Your Phone wait for 10 secs. Now Press Both Volume Key(VOL+ and VOL-) and Power Key together.
It Will Boot you In Recovery Mode.
4. Make Backup Of Current Rom By Clicking on Backup Button
5. after making backup Clear/Format cache,Format data ,Format system(don't select internal memory)
6. Now Click On Install and Select Install zip file from SD Card(that you downloaded)and Swipe For Flashing.
it will take 5 Minutes For Install and 5 Minutes For 1st Boot
TWRP (recovery.img)- goo.gl/Fgj9b4
*Use at Your Own Risk*