Install Android 5.1.1 Lollipop on Galaxy S2 Plus GT-I9105/I9105P



In this guide we are going to show you the step by step process to install Android 5.1.1 Lollipop on Samsung Galaxy S2 GT-I9105 and GT-I9105P. Galaxy S2 Plus is released 2 years back and it is also the younger brother of Galaxy S2 with almost same specs instead a little changes in hardware which include Broadcom BC28155 Chipset and Broadcom VideoCore IV GPU. The Box opened device comes with a pre-installed 4.1.2 later Samsung provided firmware updates to Android 4.2.2 Jelly Bean, now Samsung left the firmware support and the Galaxy S2 Plus stuck on Android 4.2.2 Jelly Bean. Users are searching the way to update their devices to latest firmware and thanks to AOSP devs for providing latest firmware for Galaxy S2 Plus via CM12.1 unofficial build (custom ROM).

There are multiple benefits of installing custom ROM on your Galaxy S2 which unfortunately can’t find in the stock firmware. The Custom ROMs gives you freedom to overclock CPU, install tweaking mods and tons of other software to enhance device performance further you can install themes to customize the device look. Just go ahead and install the Android 5.1.1 Lollipop on Samsung Galaxy S2 Plus.

How to install Android 5.1.1 Lollipop on Galaxy S2 Plus GT-I9105/I9105P

Disclaimer: This tutorial includes multiple operations which includes installing Custom ROMs, Custom recovery and root. Follow the guide on your own risk, we are not responsible if you brick or damage your device however the chances of bricking a device are rare but you have to pay full attention on the complete guide to avoid any issues and difficulties while performing any of the above mentioned operation.


  • Please ensure your phone battery should be charged at minimum 80%
  • Download and install latest USB drivers
  • Your device should have a working latest TWRP recovery installed or follow our guide.

Download Android 5.1.1 Lollipop build specified for your Galaxy S2 Plus from the below provided links

Download Galaxy S2 Plus Android 5.1.1 Lollipop (GT-I9105)

Download Galaxy S2 Plus Android 5.1.1 Lollipop (GT-I9105P)

Download Android 5.1.1 Lollipop Gapps

Process to install Android 5.1.1 Lollipop on Samsung Galaxy S2 Plus GT-I9105/I9105P

In this tutorial we are using the ClockworkMod recovery flash process.

Connect your device to PC and transfer the CM12.1 ROM and Gapps on your device storage.

Turn of your device and boot into CWM custom Recovery menu by the hardware keys combination or using any third party app (Mostly found in Play store).

Once your device enters into CWM recovery, create a Nandroid backup of your device or follow our guide to create a Nandroid backup (this will create a backup of your complete device including current firmware) if something goes wrong you can restore your previous firmware.

Once the Nandroid process completes, navigate and select wipe data/factory reset.(this will erase your data)

Now it’s the time to flash the CM12.1 ROM on your device. Choose “install zip from sdcard” >> choose zip from sdcard & navigate to the folder in which you have copied the custom file and select it.

Select “yes” to confirm install, wait for a few minutes till the file is completely installed in your device.

Once done with the above step, now apply the same process with the installation of Android 5.1.1 Lollipop Gapps.

Wait for the installation process to complete. The first boot up may take 5-7 minutes.

If your device is taking longer then 7-10 minutes then follow this guide to to fix this issue 

That’s it! You have successfully installed Android 5.1.1 Lollipop via unofficial CM12.1 on your Galaxy S2 GT-I9105 and GT-I9105P. Experience the latest features of Android 5.1.1 Lollipop custom ROM on your device. If you have any query feel free to contact us by posting your queries in the below provided comment section. Follow us on Facebook/Twitter/Google+ for future update.

A Software Engineer who loves to hang around latest gadgets and writes his own experiences to get the best possible and accurate information.
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