Tips & Tutorials

Update Galaxy S2 I9100 to Android 4.1.2 Paranoid Jelly Bean Custom Firmware

Galaxy S2 I9100 has still not received the official Jelly Bean software update, but the first Android 4.1.2 custom ROMs have started appearing online. You can also enjoy Android 4.1.2 JZO54K on your phone. You can install Paranoid Android 4.1.2 JZO54K on Galaxy S2 I9100 (International) if you have a custom recovery installed and your phone is rooted. Remember, this is not an official Jelly Bean firmware. It is just a custom ROM with stock Android.

In this tutorial, we will guide you how to update Galaxy S2 I9100 to Paranoid Android 4.1.2 JZO54K with complete steps. This tutorial requires you to have a custom recovery (ClockworkMod) installed on your Android phone and that is not covered here. Make sure you also backup all your data as given below. Let’s move on to the tutorial now.

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 😉

About Paranoid Android ROM:

To be honest, this is not tablet mode at all, it has nothing to do with silly build.prop hacks. This is the first and only Android rom to feature true Hybrid mode. This rom lets you scale and project every app, every widget, even systemcomponents individually. Remember, android is modular, everything is an app: Lockscreen, navigationbar, dialogs, popups, keyboards, widgets, and your regular apps of course. Apps have the capability to switch into various designs or layouts according to the device they run on. This can result in a complete new experience as many apps will transform to the better.

Now for every element that you like chose a mode (PhoneUI, Phablet/Nexus-7UI, TabletUI) and/or a size. You are 100% independent of the system DPI which runs nicely in whatever value it has been assigned to. You do not need to boot your phone into a certain DPI. Neither will most of the changes you apply require a reboot. You will not suffer from the myriads of troubles which normally haunt you under build.prop tablet mode. Your market, phone, etc. will all work, apps won’t shrink on you unless you shrink them yourself. This project will entirely transform your device, but retain the aesthetics and the feel of your phone.

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! 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 Paranoid Android 4.1.2 JZO54K on your Galaxy S2 I9100.