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Update Samsung Galaxy S2 I9100 to Android 4.4 via Unofficial CM 11 custom ROM

Wayland_ACE, XDA member and developer, managed to compile an unofficial CyanogenMod 11 build for the International Samsung Galaxy S2 device. Use this tutorial and learn how to install it on your device.

Note that this is not an official CyanogenMod build and it is not for every day usage. Install this custom ROM only for testing purposes. If you want to learn more about it then you should take a look at the Unofficial CM11 XDA thread here. Check the guidelines below before starting the installation process:

  • Use this post only for the Samsung Galaxy S2 model number I9100.
    – don’t attempt to flash this custom ROM build for any other Android devices.
  • Your phone has to be factory unlocked, rooted and running a custom Recovery image such CWM.
    – make sure that you’re running the latest CWM Recovery version, as otherwise you cannot complete the tutorial.
  • Factory Reset is required for the installation to complete correctly.
    – this process removed all data from system partition.
    – factory reset doesn’t remove internal / external storage.
  • Backup data from installed apps using Helium here.
  • Save data such as SMS text messages and APN Internet Settings using the following tools for Android: SMS backup & restore | APN Settings Backup & Restore.
  • Sync your Gmail account with your Contacts info and People details.
    – guide here.
  • Enable USB Debugging from Developer Options menu.
  • Make sure that the device’s battery has enough power left before it completely switches off.
    – in case the phone powers off in the middle of the updating process, then you will be forced to repeat the entire tutorial once again.
  • Read the entire post, don’t skip any steps and note that you shouldn’t blame us in case you brick the phone or lose any important data in the process.
  • If you cannot complete the tutorial, then you can ask for more help in comments.

How to flash Unofficial CM11 Android 4.4 custom ROM for Samsung Galaxy S2 I9100:

  1. Download the Unofficial CM11 Android 4.4 custom ROM zip from here.
  2. Download Gapps for this custom ROM from here.
  3. Connect your phone with your computer via USB cable. Now move both zip files to your phone’s internal storage.
    – after the files are copied, disconnect the device from PC.
    – do not unzip the contents of the archives.
  4. Power off your Galaxy S2 now.
  5. Boot your phone in CWM Recovery Mode now:
    – it can be done by pressing and holding Volume Up, Home and Power all at the same time.
    – release all buttons when the custom Recovery Mode appears.
  6. Create a full NANDROID Backup for the installed ROM before installing the new build:
    – select ‘backup and restore’, save the file to your internal storage.
  7. Next, Factory Reset your device:
    – select ‘wipe data/ factory reset’, then confirm the process.
  8. Now, install the new custom ROM:
    – select ‘install zip from sdcard’, then ‘choose zip from sdcard’. Find the Unofficial CM11 zip and confirm its installation.
  9. When the ROM is flashed, repeat the step 8 actions and install Gapps as well.
  10. After all installation processes are completed, return to the main CWM Recovery screen.
  11. Reboot your Galaxy S2 now.
    – NOTE: this first boot process takes several minutes to complete, which is why you shouldn’t press any buttons until the home screen of your new ROM appears.
  12. Take control over your device by entering your Google Account details when the new unofficial CM 11 KitKat home screen appears.

If the first boot process of this new ROM doesn’t complete or the device enters into a boot loop, then you will be forced to repeat the entire tutorial once again. If you do repeat the guide, then you have to make sure that you won’t skip any steps listed above.

For any extra help, use the comments field below.



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