How To Solve “No Service” and “No Imei” on Samsung Galaxy S3.

Hello guys some few months back i happened to flash a custom Rom on my T-Mobile Galaxy S3 and when on the Rom it was all good i had network and stuff but later on i decides to switch back to the stock Rom. After doing so my S3 lost network and so at first i thought it was a sim card problem but later after trying different sim cards i discovered that it was an issue with the phones software i had lost some internal applications(as i may call them)

Later i started searching for guide on how to return my phone’s network since i couldn’t do anything with it except listen to music but nothing concerning data usage, I even made a YouTube video(even thou it was too shady) noone responded to it. No worries if you happen to have the same problem if you found this page then your phone is all well. Thanks to a few forums that helped me and later found all the solution to my problem now i’m gonna help everyone in need. I don’t have a video for the procedure i never made one but i feel bad i didn’t cause its many people who are in need with no service next to gabage Galaxy S3s.

I will make sure i explain everything clearly.but first you will need to download the following application

INSTRUCTIONS:

1) Download NV reader/writer here and install these drivers.

2) Dial *#7284# and select “Qualcomm USB Settings” then check “RMNET + DM + MODEM“.

3) Create backup.

a) Click “port” in the top left and select your samsung serial port.
b) Make sure BOTH boxes in the top bar are checked.
c) Click “Connect” in the top bar.
d) Click “Read” in the top bar.
e) Click “Read” in the lower ‘NV-items’ section.
f) Save the .txt file, this is your backup

*The process will take 5-10min. The file size will be roughly 3mb and “inactive item” and “bad parameter” sections are normal.
*To restore click “Write” in the lower ‘NV-items’ section and navigate to your backup file.

4) Dial *#7284# and select “Qualcomm USB Settings” then check “MTP + ADB“.

Demonstration video HERE << Thanks to moonfire for the video.

IMEI ALREADY CORRUPT? 

Use THIS custom built tool to easily generate a backup file with your properly formatted IMEI to restore your phone!

1) Enter your IMEI (find it behind your battery) in the text box up top, hit generate then hit save.

2) Use “NV-Item reader writer” to write the saved text file back to your phone and then reboot.

For more on The same topic you can go to Xda-developers here

and also there is a popup notification that is quite disturbing called The Factory Mode you can disable it through this method.

First, download ROM Toolbox from the market or online and install manually here here

Second,In Root Browser, navigate to efs/FactoryApp/ (It will ask for root access, allow it)

In this folder there will be a file named factorymode. Click it, then click Open as…

Choose Text file, then choose RB Text Editor. This will open it as a text file. Here’s where it gets a bit confusing. If it says “OFF” (which yours will), that means it is showing the annoying box on your home screen, like this:

But if you change it to say “ON” then save and reboot, no more annoying box!

Remember, whether you are enabling or disabling it, you have to reboot for the changes to take effect. Enjoy!

I hope this helps. If it don’t or you are stuck feel free to leave a comment be and will see how i can help you.