How to fix not registered on network

Hello XDA family here is a solution to fix your corrupted IMEI

first of all you must only use this for the devices below


DO NOT USE IT FOR ANY OTHER DEVICE!

Before starting:

Backup your important data first just in case of this process corrupt your data.

Download and install Samsung mobile driver (Skip this if you already have Samsung Kies) (Link below)

Download MODEM.tar.md5 file then unzip it only one time (Link below)

Download Odin3 then unzip it (Link below) Disable the antivirus software, Close Samsung Kies and disconnect any device connected to USB
ports on your computer.

Flashing instructions :

1- Run "Odin3" as administrator, Click on PDA button and navigate to Modem.tar.md5 file that you extracted.
2 - Shut down your device and make sure your device is completely off
3 - Put your device into download mode by pressing and holding (Volume Down + Home + Power) buttons
4 - Press Volume up to continue
5 - Connect the device to your computer by USB cable and wait until you get a sign in Odin (ID:COM section) and "Added" in message box.
6 - Make sure re-partition is NOT SELECTED!
7- Click Start and wait a few seconds until you see "Added!".

P.S:
In some cases this won't fix the wrong IMEI or "not registered on network" message
If your device stuck in boot loop after downgrading, factory reset your device from recovery mode (Vol up+Home+Power)


Downloads:

Samsung galaxy S3 GT-I9300 model > here

Samsung galaxy Note 2 GT-N7100 model > here

Samsung galaxy S4 GT-I9500 model > here

Samsung galaxy S4 GT-I9505 model > here​