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Install CM 10.1 Unofficial ROM based on Android 4.2.2 Jelly Bean for Samsung Galaxy S2 Plus I9105P

An unofficial build of the Samsung Galaxy S2 I9105P has been released and you can use this tutorial to learn how to successfully install it. This is a custom ROM that is based on Android 4.2.2 Jelly Bean AOSP firmware.

Since it is an unofficial release of CM 10.1, you might find some errors and bugs while testing it. It is reported that the NFC, FM Radio and Vibration functions aren’t working. Also, the Landscape doesn’t work show correctly but you can fix this by disabling HW in Developer Options.

Wi-Fi, Wi-Fi Direct, Tethering, Bluetooth, Calls, SMS, Mobile Data, All Sensors, Photo and Video Camera, Audio and GPS are working correctly. It is expected for all the other features and functions that aren’t listed above to be working with the I9105 Galaxy S2 Plus phone.

For this new CM 10.1 experimental build of CM 10.1 to install correctly, you will first have to read the guidelines listed below:

  • use this guide only with the Samsung Galaxy S2 Plus with the model number I9105P. Don’t try to install the files that I have listed here with the I9105 model.
  • your phone has to be rooted and running a custom Recovery image such as CWM Recovery.
  • it would be best for your device to be running a stock Recovery.
  • backup all your important data before starting the installation of the custom ROM.
  • the tutorial will ask you to wipe data and factory reset the phone. This means that you will lose all the data that is stored on your phone’s system partition.
  • you can backup SMS, Call Logs info and APN Internet Settings with the following Android apps: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access will be required for some of these tools.
  • to backup installed apps data you might want to search the Google Play Store for a working tool.
  • sync your Contacts info with the Gmail account that you’ve assigned as default.
  • enable the USB Debugging from your phone’s Developer Options.
  • this is a guide that should be applied by an advanced Android user.
  • we cannot be blamed in case you lose any important files nor in case you brick your smartphone.
  • read all the instructions that I have listed in this post and don’t skip any actions listed below.
  • if you have problems completing the update, ask for extra help in comments.

Now that you know all of the above, continue to the next part of this post and learn how to flash an unofficial build of the popular CyanogenMod 10.1 custom ROM.

For any extra info you can take a look at the ROM’s XDA thread (here).

How to install Unofficial CM 10.1 Jelly Bean 4.2.2 custom ROM on Samsung Galaxy S2 Plus I9105P:

  1. Download the CM 10.1 Unofficial zip file from HERE. Save the file on your PC and don’t extract its contents.
  2. Download Gapps for CM 10.1 / Android 4.2.2 custom ROMs from HERE. Don’t unzip.
  3. Connect your phone with the computer and then move both downloaded files onto its internal SDcard.
  4. Disconnect the SGS2 Plus I9105p from PC when all files have been successfully copied.
  5. Power off the smartphone now.
  6. Boot it into CWM Recovery mode.
  7. Select ‘backup and restore’ option from the main Recovery Mode screen. Create a full NANDROID backup of the ROM that’s currently installed on your PC.
    > this will be set as a restore point that you can use in case the new ROM doesn’t boot correctly.
  8. Select ‘wipe data/ factory reset’ option and confirm.
  9. Now, select ‘install zip from sdcard’ and then ‘choose zip from sdcard’. Find the CM 10.1 Unofficial zip and confirm that you want to install it.
  10. After the new ROM has been successfully installed, you should select once again the ‘choose zip from sdcard’ option. Install Gapps zip.
  11. When you’ve managed to successfully flash this new custom ROM and the Google apps zip, then you can return to the main Recovery menu.
  12. Select ‘reboot system now’ and wait until the first boot process of the new OS will load all of its files.
  13. Enter your Google Account details when the Android 4.2.2. JB / CM 10.1 home screen appears and take control over your device.

The first boot process shouldn’t take more than 5 minutes to complete. If it takes longer or the phone enters into a boot loop, then you should power off the device completely. After that you will need to repeat the entire tutorial once again and the new ROM should flash eventually.

If you don’t like how the CM 10.1 Unofficial build runs on your Galaxy S2 Plus I9105P, then you should use the ‘backup and restore’ Recovery option and restore the NANDROID backup that you’ve created in step 7. If you have any other questions, use the comments field below.

Samsung Galaxy S2 Plus Articles