when I try to dial #7284# or #7285# I get this message. I haven't flashed yet so everything is still pretty much Virgin. Can any one shed a light on this?

Sent from my GT-I9305 using xda app-developers app

Code is *#7284#

Sent from my Nexus 7 using xda app-developers app

Ok All done, That backup process took longer then expected for a 250Kb QN file..... So let me get this straight the 20mb EFS image i had backed up previously is useless? This new 250kb QN file is the heart of our device now and should be backed up everywhere?

Another thing what happens If we leave it in diag mode or whats the difference. Thanks I would like to learn alittle

EDIT: I learnt myself lol What happens if you leave it in Diag mode is you will not be able to see your phone in windows as a Portable device, which means you cannot copy and paste files the simple way from (My Computer)

I am still curios as to why the QN file is only 250kb comparing to the previous EFS.img, It might be a good idea to state in the OP that the file should only be this XXXX Large .. Just so people feel safer once they have completed the procedure

Originally Posted by btemtd

Ok All done, That backup process took longer then expected for a 250Kb QN file..... So let me get this straight the 20mb EFS image i had backed up previously is useless? This new 250kb QN file is the heart of our device now and should be backed up everywhere?

Another thing what happens If we leave it in diag mode or whats the difference. Thanks I would like to learn alittle

It's all in the first post but maybe I need to make it a bit clearer. Phone should be in Diag Mode when performing Backup and Restore otherwise phone should be in MTP + ADB Mode.

The QCN backup file contains the data for all the NV Items in the NV Memory which is also where the IMEI is stored.

It doesn't hurt to backup the EFS partition aswell as it contains mac addresses and other important data for your device.

Sent from my GT-I9305 using Tapatalk 2

Great Just to be safe I have kept all my previous EFS backups and added the NV QCN file with them...I was mainly making sure that 250kb sounds correct yeh? it shouldnt be larger then this?

Originally Posted by btemtd

Great Just to be safe I have kept all my previous EFS backups and added the NV QCN file with them...I was mainly making sure that 250kb sounds correct yeh? it shouldnt be larger then this?

Yes 250kb is correct because its just the bytes for the NV Items thats stored in the QCN file.

efs backup without root, now that's what i am talking about
great job

Happy to ship my phone to you if you need one to play with.

Originally Posted by lyriquidperfection

After some research I discovered that backing up the '/efs' folder using existing tools such as my EFS Pro application will not work with this particular device.

Most Samsung devices have a file in the '/efs' folder called 'nv_data.bin' and on closer inspection this file is not present on our devices.

This is because the I9305 has LTE which also means its fitted with a Qualcomm chip to control the modem. This also means that our device uses a Qualcomm RIL instead of the usual Samsung RIL so the NV area of the device including the EFS structure is laid out different.

As it happens our device is not much different from some US variants of the Galaxy S III except we have the Quad Core Exynos CPU in the I9305 where as some US variants are fitted with a Dual Core Snapdragon.


Setting up QPST with your PC:

• Dial *#7284# on your phone to access PhoneUtil and select 'Qualcomm USB Settings' at the bottom. Now select 'RNDIS + DM + MODEM' and press 'OK' to return to the previous screen. Now press your 'Back' key to exit PhoneUtil. Your phone is now in DIAG Mode.
  
• Download and Install: SAMSUNG_USB_Driver_for_Mobile_Phones_1590.exe - 23.06 MB if you don't already have Kies or a USB Driver installed.
  
• Download and Install: QPST v2.7.378.zip - 14.68 MB
  
• Now connect your phone to the PC with a USB cable and wait for Drivers to install.
  
• Start the 'QPST Configuration' application and select the 'Ports' tab then press the 'Add New Port...' button. Select the COM Port that has 'USB/QC Diagnostic' next to it, change the Port Label if you like to 'Samsung GT-I9305' then press 'OK'. You should now see your phone listed in the 'Ports' tab and the 'State' should indicate 'Enabled'. You can now Close this application.

Backing Up IMEI / NV Data:

• Start the 'Software Download' application and select the 'Backup' tab.
  
• Press the 'Browse' button and choose a Save Location for your QCN File.
  
• Press the 'Start' button and wait for it to finish. This will back up all your phones NV Items and save them to the QCN Backup File.

Restoring IMEI / NV Data:

• Start the 'Software Download' application and select the 'Restore' tab.
  
• Press the 'Browse' button and select your QCN Backup File.
  
• Press the 'Start' button and wait for it to finish. This will restore all your phones NV Items from the QCN Backup File.
  
• Your IMEI / NV Data should now be fully restored. Dial *#06# on your phones keypad to check your IMEI is restored.

Restore USB Settings after Backup / Restore:

• Dial *#7284# on your phone to access PhoneUtil and select 'Qualcomm USB Settings' at the bottom. Now select 'MTP + ADB' and press 'OK' to return to the previous screen. Now press your 'Back' key to exit PhoneUtil. Your phone is now back to default USB operation.

If I have saved your bacon then please buy me a beer!

Originally Posted by narcarsiss

Happy to ship my phone to you if you need one to play with.

Sounds good but don't you need it to get insurance replacement?

Sent from my GT-I9305 using Tapatalk 2

Originally Posted by lyriquidperfection

Don't worry there is a workaround, just need to do more testing before I release it. It is basically a set of commands originally for AOSP Roms which I modified specifically for the I9305 to manually Enable or Disable the Diag Mode. So this Backup and Restore method will work for everybody.

So there's hope for me yet. thank god for that. will try to be patient as i wait for the workaround