Update Galaxy S3 I9300 on Amestris Android 4.1.2 Jelly Bean custom ROM

Current updates show about arrival of modern ‘Amestris’ custom ROM for device like Galaxy S3 I9300. It is said that Amestris custom ROM is much like official Android 4.1.2 Jelly Bean Firmware. Users who have not installed official Android 4.1.2 Firmware on Galaxy S3 I9300 have a fair chance to update their Galaxy S3 I9300 with Amestris Android 4.1.2 Jelly Beancustom ROM. Amestris custom ROM is not released by Google or Samsung. It comes with tons of features and brings latest Jelly Bean updates on Galaxy S3 I9300. If you like to update Galaxy S3 I9300 on Amestris Android 4.1.2 custom ROM then follow rest part of existing tutorial.

You probably know that act of installing custom ROM requires custom recovery such as ClockworkMod to flash. Therefore, users have to install ClockworkMod on their Galaxy S3 I9100. Besides of this, you need to make preliminary adjustments. The list of such adjustment are shown below:

  • On across updating Galaxy S3 I9300 all major data went missing. Considering this keep Samsung Galaxy S3 data protected in other storage site than internal and external memory of Galaxy S3. It should be prime concern to store Apps, APN Settings, Contact List and many others from Galaxy S3 device.
  • Make sure that Samsung Galaxy S3 drivers has been installed on your PC. Properly installed USB drivers helps to set up connection. You may install Samsung Galaxy S3 drivers on your PC after accessing Download Drivers section of this website or by pressing below link:

Download Samsung Galaxy S3 USB Drivers

  • Once problem occurs while connecting PC and Galaxy S3 then it becomes tough to transfer file between both devices. To fix such problems, you need to enable USB Debugging Mode on Galaxy S3 to make strong connection.
  • Ensure that Galaxy S3 has more than 80% battery. If device has less battery power than mentioned level, it does not function during custom ROM installation process. Consequently, that device becomes dead. So, check Galaxy S3 battery level then go ahead to update.

When above steps are taken at priority basis then after you may go ahead to update Galaxy S3 I9300 on Amestris Android 4.1.2 Jelly Bean Custom ROM.

Methods to install Amestris Android 4.1.2 Jelly Bean on Galaxy S3 I9300


Step 1

The process begins after installing Amestris Android 4.1.2 ROM on your PC.

Step 2

Then insert USB cable in PC to connect Galaxy S3 I9300.

Step 3

After connection to PC, you need to copy download zip file ‘Android 4.1.2 ROM’ then paste to SD card of Galaxy S3 I9300.

Step 4

Then after switch off Galaxy S3 I9300 and disconnect USB cable as well.

Step 5

In next move, you have to run Galaxy S3 into Recovery Mode. The device can run in Recovery Mode in condition of Switching On then pressing Volume Up + Home + Power Button altogether for a few seconds.

Step 6

Once in Recovery Mode, you need to select wipe data / factory reset option. You may use Power Button of Galaxy S3 to select Wipe Data / factory reset.

Step 7

After then you have to choose ‘wipe cache partition’ in similar ClockworkMod Recovery window.

Step 8

Then go to ‘Advanced Menu’ of ClockworkMod Recovery to choose ‘wipe dalvik cache’.

Step 9

Now go back to first ClockworkMod Recovery screen then choose ‘install zip from SD card’

Step 10

Once more Press power button to ‘choose zip from sdcard’. After then navigate ‘Android 4.1.2 ROM zip by pressing Volume key of Galaxy S3. Now select ‘Android 4.1.2 ROM zip’ after taping Galaxy S3 Power Button. After then your consent are asked to install custom ROM updates.

Step 11

When installation gets completed, you have to follow ‘+++++Go Back +++++’ then restart Galaxy S3 I9300 by selecting ‘reboot system now’. The ‘reboot system now’ option is available in recovery menu of Galaxy S3. The device takes hardly 5 minutes to reboot with updated custom ROM.

You may verify installed custom ROM after tapping Settings followed by About option of your Galaxy S3 device.

Caution: Well ! it is nice to update Galaxy S3 on Amestris Android 4.1.2 Jelly Bean custom ROM throughout above shown process. But, it is forbidden to apply above process to updates another Android devices.

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Topics:  Android