Default [Q] Help, Please! Root CF-Root-SGS3-v6.2 on Android 4.3 BY MISTAKE


I got an issue of "Not Registered Network" while dialing. I upgrade to Android 4.3 through OTA. The error still exist, "Not Registered Network". Then through my research, I found this video and thread,

I did my root using CF-Root-SGS3-v6.2 and odin on my phone with Android 4.3. It failed. Then I tried to flash using stock 4.1.2 ROM, 4.2.2 ROM, 4.3 ROM using odin, all failed.

I think my phone has been soft bricked since I can still access downloading and my computer can still recognizes it through odin.

Anyone can please help me with this issue?? I am relatively new on this and if you can show me the step to fix, I would really appreciate your efforts.

My Phone Specs,

Samsung S3 - Rogers At&t (Unlocked)
Android 4.3 (Upgraded before I root by mistake using CF-Root-SGS3-v6.2)