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CyanogenMod 9 (CM9) for Galaxy S2 HD LTE [Guide]

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The Samsung Galaxy S2 HD LTE, the mostly ignored big-screen sibling of the Galaxy S2 when it comes to custom ROMs – has received a port of CM9 ROM (based on Ice Cream Sandwich Android 4.0) thanks to the efforts of XDA Recognized Developer dsixda, also responsible for porting ClockworkMod recovery to the device. CM9 is the most famous custom ROM for Android devices, with features and options for customization and performance enhancements not found in stock ROMs.

ROM Info:

What doesn’t work:

  • Front camera (model SiliconFile SR200PC20M)

Read on to find out how you can install CM9 on Galaxy S2 HD LTE.

Compatibility

This hack and the guide below are compatible only and only with Galaxy S2 HD LTE, model number SGH-I757M. It’s not compatible with the Bell I9100M or any other Galaxy S2 variant. Check your device’s model number in: Settings » About phone.

Warning!

The methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know completely what it is. If any damage occurs to your device, we won’t be held liable.

How to Install CM9 on Samsung Galaxy S2 HD LTE

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  1. This procedure will wipe all your apps, data and settings (but it will NOT touch your SD cards, so don’t worry about those). Backup your Apps and important data — bookmarks, contacts, SMS, APNs (internet settings), etc. This Android backup guide would help you.
    Important! Don’t forget to at least make a backup of your APN settings, which you can restore later if your data connection does not work after installing the ROM. Use the backup guide to find out how.
  2. Install ClockworkMod recovery on your device by following the guide → here.
  3. Download the latest version of the ROM from the official development page.
  4. Download the Google Apps package. This will install apps like Market, Gmail, etc. which are not present in the ROM by default.
    Download Link  |  Filename: gapps-ics-20120429-signed.zip 
  5. Copy the two zip files downloaded in step 3 and 4 to the SD card on the phone (do not extract the files).
  6. Boot into CWM recovery. To do this, turn off the phone. Hold down Volume Up + Volume Down + Power buttons at the same time. The device will boot and then show “Samsung”. Let go of the buttons at the exact moment you see “Samsung”, and the phone will boot into recovery in a few seconds.
    In recovery, you can use the volume keys to scroll through options and the power button to select them. You can also use the capacitive buttons for navigation: Menu = DOWN, Home = UP, Back = BACK to main menu, Search = SELECT.
  7. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete.
  8. Then, select install zip from sdcard, then select choose zip from sdcard. Scroll to the ROM file on the sdcard and select it.
  9. [Read this step fully before attempting it] Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM will start installing. In the middle of the installation, the phone may reboot back into recovery and continue installing the ROM. However, if it simply reboots into recovery but doesn’t continue installation, repeat step 8 and install the ROM a second time manually.
  10. After installation is complete, go back to the main recovery menu.
  11. Now, repeat step 8, but this time, select the gapps-ics-20120429-signed.zip file. Select Yes on next screen to confirm installation of the Google apps package.
  12. After the installation is complete, go back to the main recovery menu and select reboot system now to reboot the phone and boot up into CM9. The first boot will take some time, up to 5 minutes, so be patient.
  13. [Important] If the phone does not boot up even after 10 minutes, turn it off by removing its battery. Reinsert the battery, boot into ClockworkMod recovery, re-install the ROM again as given in step 8, then reboot the phone. The phone will boot up properly this time. You do not need to install the Gapps package again.

If 4G LTE Connection Does Not Work:

By default the ROM is set to normal GSM (3G/HSPA). You can change it under System Settings –> More –> Mobile Networks –> Network Mode –> LTE/GSM. For some providers like Rogers you may need to manually add the APN for the LTE network as well. To verify you have LTE working, you’ll see the “4G” icon on the notification bar. In addition, you can run the Speed Test app to ensure you get LTE download speeds like 25Mbps instead of 4 Mbps.

CM9, based on Ice Cream Sandwich Android 4.0, is now installed on your Samsung Galaxy S2 HD LTE. Visit the official development page for more information and the latest updates on the ROM. Share your thoughts on the ROM in the comments below.

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