Originally Posted by GunPowder55555
I want to format the phone and reinstall lollipop should I use twrp and then use your method?
No, you can directly flash the Lollipop stock ROM from SP Flash Tool..
If you wish, using TWRP or whatever, clean wipe the phone (system, data and cache partitions) and flash the Lollipop update.zip
or you can even use the 5.1 OTA if you have it