Originally Posted by ShrekOpher View Post
Go into your phone and check the "About Device" > Status section. Se if anything is under the baseband and IMEI.

It may have gotten deleted when you went to 4.3. We can fix it if it has.

Sent from my SAMSUNG-SGH-I317 using xda app-developers app

---------- Post added at 09:15 PM ---------- Previous post was at 09:01 PM ----------

If you want you can get to 4.3 with working signal below. The first one will update you to 4.3 android and 4.3 bootloader w/ knox. The second will get you root back. (It will trip knox but that's no big deal) once you have root back download ROM manager and install CWM. Then I recommend flashing JediMasterX 2 as your rom. But that is more preference, their are a lot of good roms.

One click Odin AT&T 4.3 update Note2 -> http://forum.xda-developers.com/show....php?t=2496292 direct download link https://mega.co.nz/#!alo3HAZC!L8nSwj...puNaccpX2__ph4

youtube video with instructions https://www.youtube.com/watch?v=zwUdd_SkzSQ

CF Auto Root -> http://forum.xda-developers.com/show....php?t=1980644

Sent from my SAMSUNG-SGH-I317 using xda app-developers app

****I updated the above post with the direct download links and the youtube instructional video****