Smile Want to back jelly Bean v4.1 official in Note 2 i317

Hey Guys! Em new Android user. i updated my note 2 At&t jelly Bean 4.1 to Kitkat 4.4.1 .. but now i want jelly Bean back.. what do i do?
and another thing after update my mobile's model no. had changed from i317 to GT-N7105.. if i want to downgrade my mobile which file i have to use?? i317 or GT-N7105's file??
plzz guide me
Thanks