Install Android 5.1.1 Fusion Lollipop Custom on Galaxy S2 I9100 – How To

Android 5.1.1 Fusion Lollipop custom ROM, based on the latest AOSP release is now available to download for the Samsung’s old smartphone Galaxy S2 model number I9100. The company is not going to roll out any latest firmware updates for these devices but thanks to the custom ROMs developers that Galaxy S2 users can now experience the Android 5.1.1 Lollipop on their devices. Android 5.1.1 Fusion Lollipop is very close to stock Android Lollipop and there are no fancy animations, wallpapers or features added. In short this is a stable, pure stock and simple ROM. So if you want to update your Galaxy S2 I9100 then go ahead and follow the given instructions.

Keep in mind that this is a custom ROM which is developed by the third party developers, not officially released by Samsung. You’ll need to have a custom recovery like CWM or TWRP already installed to flash the ROM and Google Apps package .zip files on your Galaxy S2. In this guide we’ll use the latest version of a CWM recovery to flash the ROM but the device should be rooted. Proceed to the installation guide.

Install Android 5.1.1 Fusion Lollipop Custom ROM on Galaxy S2 I9100


This tutorial containing the download links for Android 5.1.1 Fusion Lollipop Custom Firmware and instructions can be used only for the Galaxy S2 GT-I9100. Check the model number of your device first by navigating to Settings > About Phone.


AndroidBlog will not be held responsible for any kind of damage occurred to your Galaxy S2 during or after the installation of Android 5.1.1 Fusion Lollipop Custom ROM. Proceed at your own risk.


  • Take a proper backup of all your existing data and settings before proceeding to the ROM installation guide using a recommended custom recovery like CWM or TWRP.
  • Download and install the correct USB Drivers for the Galaxy S2 on the PC.
  • Enable USB Debugging Mode on your device by navigating to Settings > Developer Options.
  • Your device should be rooted with CWM recovery installed on it.
  • The bootloader of the Galaxy S2 phone must be unlocked.
  • Make sure that the battery level of your phone should be charged at least about 70%.

Required Files:

Steps to Flash Android 5.1.1 Lollipop on Galaxy S2 I9100 via Fusion Custom ROM:

1:- First, download Android 5.1.1 Fusion Lollipop Custom ROM ( for Galaxy S2 I9100 on the desktop of the PC.

2:- Connect the Galaxy S2 to the PC using its USB data cable and mount its USB memory storage.

3:- Copy the Android 5.1.1 Fusion Lollipop Custom ROM .zip file that you’ve already downloaded from the above link, to the root folder of your SD card on the phone.

4:- Disconnect the phone from the PC and switch it OFF to boot it into Recovery Mode.

5:- Switch ON your device while pressing and holding Volume Up + Home + Power buttons at the same time to enter into Recovery Mode.

6:- While your device is now in CWM Recovery, perform wipe data/factory reset, wipe cache partition and wipe dalvik cache also by navigating to Advanced > Wipe Dalvik Cache.

Note:- wipe dalvik cache will help you to prevent boot loops and other errors while ROM installation.

7:- Go back to the main Recovery Menu and choose install zip from SD card → choose zip from sdcard.

8:- Navigate to the Android 5.1.1 Fusion Lollipop ROM .zip file which you’ve already transferred to the SD card of your device previously. Select the ROM .zip file using the Power button and confirm the installation to begin.

9:- Navigate to +++++Go Back+++++ once the installation is completed. From Recovery Menu, reboot your device by selecting reboot system now.

Your Galaxy S2 I9100 will be rebooted and may take about 4 to 5 minutes to boot for the first time after installation.

That’s All! You’ve successfully updated Galaxy S2 I9100 to Fusion Custom ROM featuring Android 5.1.1 Lollipop manually.

Let us know in the comments section below if you have any query or problem regarding the above tutorial to install Android 5.1.1 Lollipop based Fusion ROM on your Galaxy S2.

Aamir Jamal

An Android Geek and audiophile who love to read and write reviews/tutorials about gadgets and new tech stuff. He has written 1007 guides and other posts.

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