Tips & Tutorials

Install Android 4.1.1 JRO03H AOSP on Galaxy S2 I9100 Custom Firmware

Samsung Galaxy S2 has already got a number of custom Android 4.1 Jelly Bean ROMs, but all of them have their own custom mods and tweaks installed. Many of you would like to experience the stock Android experience like the Nexus devices on your Galaxy S2. This custom ROM is based on Android 4.1.1 JRO03H Jelly Bean AOSP and is now available to be installed on Galaxy S2 I9100.

As you continue reading below, we will guide you through the process of how to install Android 4.1.1 JRO03H on Galaxy S2 I9100. Please make sure to backup all your data as this tutorial will wipe your internal storage. Let’s get on with the tutorial now.

Galaxy S2

Disclaimer: All the tools, mods or ROMs mentioned below belong to their respective owners/developers. We ( or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial 😉

Make sure you have installed all your USB drivers for the Samsung Galaxy S II to connect it with the computer. Download Samsung Galaxy S II USB drivers! Apart from just the USB drivers, there are a few more things that you need to take care of.

1. You need to enable USB debugging mode. This helps to connect your Android phone with the PC. See here: How to Enable USB Debugging.

2. Your phone battery should be 80-85% charged. If your phone goes off suddenly because of battery, during flashing ROMs or installing mods and updates — your phone might go dead permanently. See here: How to Check Battery Percentage.

3. Backup all your important data that you might need as soon as your flash a new ROM, or make a backup for just in case, you never know when anything might go wrong. See below on how to backup data:

4. Your Samsung Galaxy S II should be factory unlocked. Additional instructions for locked Android devices will be added in the tutorial for unlocking devices.

Now, let’s proceed with the tutorial on the next page and install Android 4.1.1 JRO03H AOSP custom ROM on your Galaxy S2 I9100.