How to Fix "Not Registered on Network"/Wrong IMEI for Galaxy S3/S4/Note2 v4.1.2

This tutorial will learn you how to fix "not registered on network", wrong IMEI for :

• Samsung galaxy S3 GT-I9300 model ONLY.
• Samsung galaxy Note 2 GT-N7100 model ONLY. 
• Samsung galaxy S4 GT-I9500 model ONLY.

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 [Very important]

7- Click Start and wait a few seconds until you see "PASS!".

Notes :

• Do not disconnect the cable or turn off the device while flashing
• I am not responsible if something wrong happened to your device (use this AT YOUR OWN RISK)
• Install Samsung Mobile Driver or Samsung Kies if you don't see a sign in Odin(Step 5)
• This process takes maximum 1 minute
• 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 :
• Odin3_v3.04 http://www.mediafire.com/download/zfz4xfurble3g00/Odin3_v3.04.rar 
• Or Odin3_v3.07 http://www.mediafire.com/download/rp3g3po6rl7yz36/Odin3_v3.07.rar
•  Samsung Mobile Driver http://www.mediafire.com/download/p6pplwvwtc9y4kk/SAMSUNG_USB_Driver_for_Mobile_1.5.5.0.rar 
• Latest Samsung Kies http://www.mediafire.com/download/oe7cxalrrexep4v/Kies+2.6.1.13105_7.zip
• Modem_I9300XXEMG4 http://www.mediafire.com/download/xdfjvkf4iloxwq4/Modem_I9300XXEMG4.tar.md5.zip
• Modem_N7100XXDMG1 http://www.mediafire.com/download/9li221fj96r66qb/Modem_N7100XXDMG1.tar.md5.zip
• Modem_I9500UBUBMG9 http://www.mediafire.com/download/z8cuymh0hrapydx/Modem_I9500UBUBMG9.tar.md5.zip

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