Galaxy S II

How to Update Galaxy S2 I9100 with Lollipop 5.0 Android OS – Guide

Samsung Galaxy S2 I9100 Android smartphone can now be installed with the Android 5.0 Lollipop OS. Yes, you have read this one right! Unfortunately, Samsung won’t be releasing any further updates to the device and now the only option left to install the future updates is the custom ROMs. Cyanogen Mod is one such promising custom ROM maker which are not just stable but also comes with the lot of variations which ensures that you are never bored of your android device. This new Android 5.0 firmware comes with an all new UI clubbed with the completely re-designed experience. This is the Stock version and the Touch wiz interface is not there in this OS.

So after checking out on what are the list of quick pre requisites you need to follow, we will be checking out the detailed guide which will help you update the device.

Galaxy S2 Lollipop 2 Galaxy S2 Lollipop 3 Galaxy S2 Lollipop 4 Lollipop Galaxy S2 Galaxy S2 Lollipop 1

Quick Pre Requisites:

  • All the data in your Samsung Galaxy S2 should be backed up manually and not with the Samsung KIES or any desktop apps as it might not help you restore the data.
  • For applying this device, you need to have root access in your phone. To check on whether the device is rooted or not, download “Root Checker” app from Google PLAY Store.
  • Enable USB Debugging option from Settings > Developer Options in your Galaxy S2 device. Also, install the latest version of “SuperSU” app from Google PLAY Store.
  • Minimum battery left in your device should be at least 50%.

Disclaimer: Follow all the instructions mentioned in this article as if there is any damage caused due to not following instructions then we shall not be held liable or responsible. Just in case if you face any issues then we will try our level best to address the same.

Let’s get started with the next step where we have mentioned the detailed guide for updating your device with this firmware.

Procedure to Update Galaxy S2 I9100 with Lollipop 5.0 Android OS:

  • Connect your phone to the computer with the help of original USB cable to place the 2 downloaded files in your device.
  • Disconnect the device so that it can be entered in the Recovery mode.
  • Recovery mode in Galaxy S2 can be entered by turning Off the device first and then press the Volume Up + Menu button to start the device in the recovery mode.
  • In recovery mode, all you need to do is to just select the option of “install zip from sd card” and choose the Lollipop 5.0 Android Firmware package and then the Google Apps Package which you have earlier placed in your phone. Once the firmware is applied successfully, you need to select “go back” and choose “reboot system now” for rebooting the device in the normal mode. Please note that it will take around 3 -4 minutes for applying the update.

Note: If the device gets into the boot loop sequence or say gets stuck in the welcome screen, just long press the power button and re follow the above instructions so as to again follow the above mentioned instructions.

Do let us know in the comments section just in case if you face any issues in the comments section below.




  1. jesse

    December 23, 2015 at 6:28 pm

    The installation process stops:E:failed to verify whole-file signatureE:failed to verify whole-file signatureE:signature verification failedSo what do I do? Is there a problem with the zip-file?Anyone has a clue?

  2. basheerk

    June 2, 2015 at 12:00 pm

    Am phoan nwe lolipap updaet

  3. Prabhu

    February 21, 2015 at 2:23 pm

    Try unmounting /system before flashing. I am also using TWRP.

  4. eric

    February 8, 2015 at 6:44 am

    I cannot download into my the google app package to the sd card everything starts out fine but after it says about 35 mins to go it just stops the android 5.0 OS went just fine is now on my sd card I have more than enough storage left (32gb) sd card how do I resolve

    • Pradeep Neela

      February 8, 2015 at 8:34 pm

      just reset the device, there might be an issue with the cache

  5. Ali

    January 15, 2015 at 5:20 pm

    Thanks, but unfortunately I received the error “failed to verify whole-file signature” while installing it from sd card.
    please help.

    • Prabhu

      February 21, 2015 at 2:27 pm

      Try unmounting /system before flashing. I am also using TWRP

  6. Smart

    January 8, 2015 at 1:59 pm

    Thnx for the article, but i have problem: how to root my Galaxy S2 GT I9100 Android Phone with Jellybean 4.1.2 XXMS7 Android Firmware?


    January 4, 2015 at 11:58 pm

    Thanx to Developers.

  8. Abdullah

    January 4, 2015 at 10:31 am

    Will applying this update delete my apps and wipe out my data?

  9. Robin

    January 4, 2015 at 8:15 am

    The installation process stops:

    E:failed to verify whole-file signature
    E:failed to verify whole-file signature
    E:signature verification failed

    So what do I do? Is there a problem with the zip-file?
    Anyone has a clue?

    • Vikas

      May 8, 2015 at 3:47 pm

      Same problem is here bro ………

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