A brand new Android 4.2.2 JB-based custom ROM for the Samsung Galaxy S3 has been released. You can learn how to install this new ROM using the instructions that are listed below.
The device that’s supported by this guide is the Samsung Galaxy S3 I9300 and not the I9305 version. As you know, you can check the model version of your smartphone by going through Settings and then opening the About Phone section.
AvatarROM 2.15b custom ROM is based on AOSP Android 4.2.2 Jelly Bean, CyanogenMod 10.1 Release Candidate , MIUI themes and it borrows some of the features of Samsung’s TouchWiz Nature UX interface. In order to make sure that you correctly flash this update, you will first need to read the guidelines listed below:
- use this tutorial only for the Samsung Galaxy S3 I9300 smartphone. Do not attempt to update any other devices using this tutorial, as you will end up bricking it.
- your device has to be factory unlocked, rooted and running a custom Recovery image such as CWM or TWRP. I have used the CWM Recovery for this tutorial, but the TWRP Recovery version will work just fine.
- use the custom Recovery image to create a full NANDROID backup of your currently installed ROM. This will set a restore point for your device and it can be used in case something goes wrong and you cannot boot your phone into normal mode.
- for this new ROM to install all the required files and, for the smartphone to boot into normal mode, you will have to factory reset the Galaxy S3. This means that you will lose data that’s stored on your device’s system partition. The internal and / or external SDcard won’t be affected by this process.
- you can backup SMS, Call Logs and APN Internet Settings using the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is needed for some of these tools, grant it.
- to backup installed apps, use the Google Play Store and search for a working tool that is capable of backing up entire applications.
- sync your Contacts with your Gmail account so that you won’t lose any important phone numbers or any other Contacts data that’s currently stored on your device.
- enable the USB Debugging option from the Developer Options menu.
- if the Developers Options menu is not displayed in the Settings screen, then you should click About Device, scroll down and tap 7 times on the Build Number section.
- make sure that there is enough power left in your phone’s battery, as you wouldn’t want for your smartphone to power off in the middle of the updating process.
- this is a guide for advanced Android users, don’t try to flash any files in case you don’t know what you’re doing.
- you cannot held us responsible in case you brick your device or you lose any data in the process.
- don’t skip any steps listed below.
I think that these were all the steps that you had to take in order to prepare your smartphone for the installation of a new Android 4.1.2 Jelly Bean Custom ROM. If you cannot complete the install, then you should ask for extra help in comments or, head straight to the developer’s XDA thread here.
How to flash AvatarROM Jelly Bean 4.2.2 build for Samsung Galaxy S3 I9300:
- Download the AvatarROM JB zip from HERE.
> save the file on your PC and don’t unzip its contents.
- Download Gapps for Android 4.2.2 custom ROMs from HERE.
> save it on your PC and don’t extract the contents.
- Connect your smartphone with your computer.
- Move both downloaded files to your Galaxy S3 internal SDcard. When the files are copied successfully, disconnect the device from PC and power it off completely.
- Next, boot the Galaxy S3 into Custom Recovery mode.
> I have used the CWM Recovery for this tutorial, but the TWRP Recovery will work, too.
- Select ‘backup and restore’ option from the main Recovery screen menu. Create a full NANDROID backup of your currently installed ROM, so that you’ll set a restore point for your smartphone.
- Select ‘wipe data/ factory reset’ option and confirm this process.
- When the data is wiped, you should return to the main Recovery screen and select ‘install zip from sdcard’.
- Now, select ‘choose zip from sdcard’ and browse your phone’s internal SDcard for the AvatarROM zip file. Confirm that you want to install it and wait for the process to complete. It shouldn’t take more than a couple of minutes.
- When the ROM is installed, select once again ‘choose zip from sdcard’.
- Find the Gapps zip and confirm the installation.
- After you’ve managed to successfully flash both files, you will need to return to the main Recovery screen. Select ‘reboot system now’.
- Now the device will boot into normal mode, but note that the first boot process of the new OS should take a while before loading all the new files.
- Enter your Google Account details when the home screen appears.
- Take control over your phone and start testing all the new features and functions.
In case the first boot process takes too long to complete or the smartphone enters into a boot loop, then you should switch off the device by removing its battery. Re-insert the battery after 5 seconds have passed and then repeat the entire tutorial once again. The second time you have to make sure that you don’t skip any steps listed above, make sure to apply teh actions listed under step 7.
If you don’t like this new OS, then you should use the backup files created in step 6 and restore the former Galaxy S3 ROM. If you have any other questions, then you should ask for extra help in our comments field, but make sure to leave a detailed comment, so that we will come up with a viable solution.
The ROM that you’ve installed is the beta version of Avatar build and if you find problems while testing it, then you might also want to try to flash a more stable release. Download AvatarROM 1.3 Final version from HERE. Use the same tutorial steps listed above to complete the installation.