Amestris Custom ROM is based on Android 4.1.2 Jelly Bean and now supports Galaxy S3 I9300. This custom ROM features multiple functions and enhancements including a darker theme named BlackDiamond - an improvement from the TouchWiz SGS3 stock theme. Apart from that, Amestris custom ROM includes many features like:

Busybox and superuserMulti-language supportCenter clockNew dialogue frames, checkbox buttons, button &tab design, CallScreen Layouts, etcExtended power menu optionsNew battery look & Amestris status barBigger caller screen photorooted, odexed all stock applicationsstock kernel installedTorch via Home button when using the lock-screen & many other features.

Follow this very simple guide to root Samsung Galaxy S3 to Android 4.1.2 Jelly Bean Amestris which is an amazing custom ROM for I9300 models.

Note:Please use this tutorial only for Samsung Galaxy S3 model number I9300. Do not try it on any other Android devices and models.

Prerequisitesbefore you root Samsung Galaxy S3 to Android 4.1.2 Jelly Bean Amestris:

Create a backup of all important data in your Galaxy device.Download and install USB drivers for Galaxy S3 in your computer.Enable USB debugging option by pressingMenu>Settings>Applications. Navigate and tap onDeveloper Optionsto ensure thatUSB Debuggingis enabled.Make sure that ClockworkMod or TWRP recovery is installed.Ensure that your S3 carries more than 80% of charge.

How to root Samsung Galaxy S3 to Android 4.1.2 Jelly Bean Amestris - Custom ROM:

Download the required files from here.

Connect Galaxy S3 I9300 to your computer using USB cable and copy the downloaded file to the SD card of your handset.Do not extract any files.Disconnect USB and turn yourGalaxyS3 off. Boot in to custom recovery mode by pressing and holdingVolume Up, Downand thePowerbuttons simultaneously until the Samsung logo shows up. Leave the buttons for half a second and hold again. UseVolumekeys to highlight andPowerbutton to select.Alternatively you can useQuick Boot appto reboot your Android device in recovery mode.Next, perform Nandroid backup of your existing ROM to be restored laterif this new ROM does not work or you want to move back. SelectBackup and Restore>Backup. Go to recovery menu after backup process is done. -very important step to switch back.Wipe the data by going towipe data/factory reset>Yespath. When done, come back to the main CMW recovery menu and selectwipe cache partition, once it’s finished, tap onAdvance>wipe Dalvik Cacheto wipe Dalvik cache data.Next, from sdcard selectinstall zip from sdcardand choosezip from sdcard. Locate theAmetris ROMzipfile copied earlier and select it by pressingpowerbutton. Select yes to confirm installation and wait for the ROM installation to complete successfully.Once the ROM is successfully flashed, go back to the main CWM recovery menu and selectreboot system nowto boot up into the latest custom Ametris ROM based on Android 4.1.2 Jelly Bean.

Ta da! You have just flashed your Samsung Galaxy S3 I9300 to the Ametris Android 4.1.2 JB custom ROM! Let us know how do you find its features and functions.