Since there are numerous custom ROMs updates available for the Galaxy S3 handsets you should notice that it is important to know how to downgrade your phone to the stock ROM too. There are many reasons for concluding the mentioned fact, but I will detail the same a little bit later. For now, you must know that during the next few lines we will be checking in how to downgrade the Sprint Samsung Galaxy S3 model number L710 to the stock Jelly Bean LJ7 firmware and reset its flash counter so that you can restore the warranty of your device.
This operation can also be considered as an update to the official Android 4.1 LJ7 ROM, as maybe you haven’t installed the Jelly Bean OS on your Sprint Galaxy S3 yet. Anyway, whether you want to downgrade to the stock ROM or to update to the official software, this tutorial is all you need. Completing the same will be more than easy as you don’t have to use custom apps like Odin or who knows what else. All you need to do is to download the stock OS and then flash the ROM on your Galaxy S3. Of course you will be able to learn more about the installation procedure during the proper steps.
Now, you need to downgrade your Sprint Samsung Galaxy S3 L710 to the stock Jelly Bean 4.1 if you have recently updated your phone with a custom ROM firmware. There are many beta upgrades available for your S3 so it’s hard to think that you haven’t applied such a custom OS until now. Anyway, as you know, by flashing a custom ROM you void the warranty and increase the flash counter of your smartphone. The flash counter is what counts the unofficial updates that are being added to your phone, so that those of Sprint know that the warranty was void. This means, that in case you somehow brick your handset and want to fix it by going to Sprint, you will then have to pay a lot of money for the same.
Therefore, in order to avoid the scenario mentioned above, or if you just want to restore the default version of the Android system on your Sprint Galaxy S3, then all you need to do is to downgrade to the stock ROM and reset the flash counter. Take note that once you do this, the root access will be revoked so if you will want to re-root your device, you will have to follow a guide suitable with the new OS. However, before applying the steps from above, you first need to prepare your handset.
As you are going to use a custom recovery image (this implies that CWM recovery is already installed on your device) for flashing the official update on your SGS3 L710, first you need to backup the data. By using our backup and restore guides you can easily learn how to backup the EFS folder, the contacts, messages, call logs, and almost everything else you need to, so don’t hesitate and use the same. Be aware as if you choose to skip this part you can lose all of your personal info that are being saved on your phone’s internal storage memory. Again, don’t forget to install a custom recovery image after proceeding to the next section of the present tutorial.
Now, for ending the pre requisites enable the USB debugging option on your Galaxy S3. Then, on your Sprint version of the S3 and on the computer you will have to deactivate all the security programs as these tools might interfere with the downgrade process. Also, charge the battery of your handset or else it might get turned off in the middle of the operation. And do not apply the next steps for resetting the flash counter of a similar smartphone with the Sprint Galaxy S3 model number L710, because you will risk in bricking your device.
How to Downgrade Sprint Galaxy S3 to Official Jelly Bean Stock ROM and Reset Flash Counter
- Download the update file corresponding with the version of your handset (for the 16 GB variant, use this link and for the 32 GB one, use the link from here).
- Save the file on your computer.
- Then, copy the file from the computer to your device’s SD card.
- Unplug the USB cord that was used for connecting the smartphone with the PC and turn off the S3.
- Reboot in recovery mode.
- For recovery mode: press and hold the Volume Up, Home, and Power buttons at the same time.
- First, in recovery select “wipe data factory reset” and “wipe cache partition” (this is why you need to previously backup the data).
- Up next, return to the CWM recovery menu (“+++go back+++”).
- And select “install zip from sd card” followed by “choose zip from sd card”.
- Now, pick the downloaded file from the SD card and flash the same.
- When the installation process ends select “+++go back+++” and then “reboot system now”.
So, that was all for today. Now you know how to downgrade the Sprint Samsung Galaxy S3 L710 to the Jelly Bean 4.1 stock ROM and how to reset the flash counter. The warranty is now restored so you have nothing to worry about. Remember that you should bookmark this guide as maybe you will need it for the future too. But, first do share your impressions about the above explained tutorial with us and with other users by using the comments area from below. Also, we must thanks those of xda-developers as they were the first to develop and test this how to guide.