How to roll back to Android 5.1?

[AC Question]

How to roll back to Android 5.1

I downloaded the new update 5.1.1 and just hate it. The lock screen is so much smaller. The split screen is terrible. How can I roll this back?

 

[Rukbat]

You can't back an update, you have to back everything up, then flash the earlier ROM and restore everything. (TWRP or CWM make it easier - back up, flash the new ROM, restore only the data.)