can i revert back to kitkat from lollipop in my note 3 neo

[AC Question]

My Samsung note 3 neo set was working too good until it got automatically upgraded to lollipop . now it has become too slow and hangs up anytime. what can I do??

 

[Rukbat]

Not exactly "revert back" - you have to flash the KitKat ROM. You'll lose everything you've done to and with the phone since you got it, so back everything up (see Backing up an Android Device). To flash the ROM, see [Samsung] How to flash Stock ROM via ODIN.