Install Slim Bean Custom ROM on T-Mobile Galaxy S3 and Update to Jelly Bean 4.1.2

The Slim Bean Rom is getting more and more popular among the Android users as the update is being developed for new devices as we speak. Maybe it is because of its CM10 and AOKP features that are being combined in the Slim Bean system, or because of the latest Android 4.1.2 Jelly Bean OS that is being included, but what interest us the most is to enjoy a stable and powerful firmware that can really power up the performances of our smartphones and tablets. Anyway, if I have aroused your attention, then you should know that the Slim Bean software is now available for the T-Mobile Galaxy S3, so we will be checking in how to update your phone with the same.

For those who don’t know for what the Slim Bean custom ROM is being know here are some info that might please you. First if you do decide to install the OS on your Samsung Galaxy S3 T999, you have to know that the firmware will optimize and customize the performances of your smartphone by removing the extra programs and bloatware apps that runs on your phone. In this way you will be able to receive more power and better RAM memory from your SGS3 and also enjoy an improved Android 4.1.2 Jelly Bean experience.

But that’s not all. The Slim Bean platform comes with features from the CM10 and AOKP ROMs along with a new look and extra capabilities, so your Galaxy S3 will be running a powerful software suitable with your demands. For the full list of features you can anytime check our source page by using the link from here. The update is being developed and provided by those of xda-developers so we have them to thanks for this step by step guide, which is now suitable with the T-Mobile Galaxy S3.

Another aspect that is extremely important is related to the actual update: it is not an official one so Samsung has nothing to do with the below procedure. As mentioned the Slim Bean Android 4.1.2 OS has been developed by the xda-developers team, meaning that you cannot use KIES or OTA apply the firmware on your Galaxy S3. Furthermore, a manual method is being required and the same is being explained in this step by step guide. But, the operation is complex and risky and you can end up in bricking your smartphone if you mess things up, so be careful in what you do.

Also, considering the up mentioned, by flashing the ROM on your T-Mobile SGS3 you will void the warranty of your phone. Unfortunately the only way possible in which you can restore the warranty is by downgrading to the stock ROM or by waiting for a new official update to be released by Samsung for your Galaxy S3 T999. Then, you need to prepare the device for the installation procedure that will shortly follow.

For that, you should start by rooting the S3. In this way you will be able to unchain its internal system, as the Slim Bean ROM will require access to some internal files in order to work properly. After gaining root access, a custom recovery image, like CWM recovery, must be installed on your handset. By using this tool we will apply the firmware on your Galaxy S3, so completing these tasks is not an option for you.

Next and as you will see during the steps from below, a wipe will have to be performed. What does this means? Well, all of your personal info will be wiped out, so you first have to complete a backup operation. By doing the same you can easily save the contacts, messages, call logs, market apps, EFS, internet folder and so on. That should be fine, though a Nandroid backup is also recommended. In this way you can save the current ROM too, so if something wrong happens with the new one, you will be able to easily restore and use the stock software.

Finally, you have to ensure that a notebook, or computer is near you. The PC must have internet connection enabled because you need to download the update file (you have the download link below). Deactivate the antivirus or any other security tools from your computer as these programs are usually interfering with our work. Also, it is a good idea to charge the S3 if you notice that the battery status shoes less than 50% power; else the phone might get turned off in the middle of the update operation and we don’t want that to happen. Remember that this tutorial must be applied only for installing the Slim Bean Jelly Bean 4.1.2 custom ROM on the T-Mobile Samsung Galaxy S3 model number T999.

How to Install Slim Bean Custom ROM on T-Mobile Galaxy S3 and Update to Jelly Bean 4.1.2 OS

  1. Download the Slim Bean update file by using the link from here.
  2. Also get the Google Apps package from here as it is not included in the update system.
  3. Then, copy-paste these files on your device (on its SD card) – first connect the handset with the computer via USB cable.
  4. Unplug the USB cord and turn off the smartphone.
  5. Now, reboot the Galaxy S3 into CWM recovery: press and hold the Volume Up, Power, and the Home buttons at the same time.
  6. From the recovery mode that will be displayed select the following: “wipe data factory reset”, “wipe cache partition” and “wipe dalvik cache”.
  7. The internal system will be wiped out; in the end select “+++go back+++”.
  8. Now, by using the recovery menu select “install zip from sd card” and “choose zip from sd card”.
  9. Pick the update file and install the same.
  10. Then, repeat the process and apply the Google Apps package too.
  11. Finally, when everything is done, select “+++go back+++” and “reboot system now”.
  12. If the first boot will take longer than usual, don’t worry there is nothing wrong with your device.
  13. Also, if you get a boot loop, perform the wipe again, similar as already showed above.

So, there you have it; that was the how to procedure from which you can learn how to update the T-Mobile Samsung Galaxy S3 with the Slim Bean Android 4.1.2 Jelly Bean custom ROM firmware. If you don’t like the new software, you can anytime restore the stock one by rebooting into recovery again; of course this is possible only if you have applied the Nandroid backup as recommended during the pre requisites. That was all for today, but stay close for further updates, tutorials and Android related tricks and tips.