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How to update T-Mobile Galaxy S4 to Android 4.2.2 Jelly Bean using CM 10.1 Nightlies ROM

T-Mobile Samsung Galaxy S4 is now supported by CyanogenMod and you can use this post to learn how to successfully flash the CM 10.1 Nightlies ROM. Read the entire post and you should be able to flash all the required files easily without bricking your device.

CyanogenM0d 10.1 is one of the most popular Android 4.2.2 Jelly Bean custom ROM. It comes with tons of new features and if you like the AOSP pure Android operating system, then this is the ROM you’re looking for. It doesn’t contain any bloatware and you will also get rid of all the T-Mobile applications.

In order to successfully flash the CM 10.1 nightlies for the Samsung Galaxy S4 T Mobile, you will first have to take a look at the preparation guide below:

  • use this tutorial only with the T-Mobile variant of Samsung Galaxy S4. Also, your device should have the M919 build number. Don’t try to flash the files you find here on any other Android smartphone or tablet.
  • your phone has to be rooted and running a custom Recovery image. I’ve used the CWM Recovery for this tutorial, but the TWRP one will work in the same way.
  • it would be best if you’d create a full NANDROID backup of your currently installed ROM. This will set a restore point that you can use in case the new OS doesn’t work as you’d expected it or the TMO Galaxy S4 doesn’t boot in normal mode after the installation is complete.
  • the tutorial will ask you to factory reset the phone, which is why it would be best for you to backup some data that’s stored on your phone’s system partition: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is require for some of these tools, so you should grant it.
  • the contents of the internal SDcard will not be affected by the installation of a new ROM.
  • sync the Contacts info with your Gmail account. This will help you store all the phone numbers and Contacts data somewhere safe. Make sure to sync the data back with your phone after the new OS is installed.
  • enable USB Debugging from Developer Options menu, it is located in Settings.
  • make sure that there is enough battery power left in your smartphone before starting the installation.
  • this is a guide for users who want to tinker with their smartphones. If you don’t know what you’re doing then it would be best not to flash a custom ROM.
  • we cannot be held responsible in case you brick your phone or, in case you lose any data while attempting to flash CM 10.1 Nightlies ROM.
  • don’t skip any steps listed below.
  • if you cannot complete the tutorial, then you should ask for more help in comments.

NOTE: if your device is already sporting a previous version of CM 10.1 Nightlies build, then you can skip the ‘Factory Reset’ step and, instead, flash the new build over the previous one. But, in case the phone doesn’t want to boot after you complete the install, then you will be forced to repeat the tutorial and apply ‘factory reset’.

Remember that this custom ROM does not contain any Samsung ‘S’ feature nor the fancy camera functions that were added with Jelly Bean 4.2.2 firmware. This is basically pure Android 4.2.2 AOSP ROM.

These were all the instructions that you had to review before getting to the ‘how-to’ guide.

How to update T-Mobile Galaxy S4 to Android 4.2.2 JB using CM 10.1 Nightlies ROM:

  1. Download the CM 10.1 Nightly build zip from HERE. Save the file on your PC and don’t unzip it.
  2. Download Gapps for Android 4.2.2 custom ROMs from HERE. Don’t unzip the file.
  3. Connect the TMO SGS4 to your computer using the USB data cable.
  4. Proceed and move both, the ROM and Gapps, files onto your smartphone’s internal SDcard. Disconnect the device from PC when all files are copied successfully.
  5. Power off your phone completely.
  6. Boot it into CWM Recovery mode by pressing Volume Up, Home and Power buttons, all at the same time. If you can’t do it, then this guide here might help you learn.
  7. Select ‘backup and restore’ option from the custom Recovery Mode main menu. Create a NANDROID backup of your current ROM.
  8. When done with the backup, select ‘wipe data/ factory reset’. Confirm.
  9. Next, select ‘install zip from sdcard’, then ‘choose zip from sdcard’. Find the CM 10.1 Nightly zip and confirm that you want to install it.
  10. After the custom ROM is successfully flashed, select again ‘choose zip from sdcard’. After that you need to find the Gapps zip. Confirm its installation.
  11. When both files have been successfully installed, you should return to the first screen of the Recovery mode.
  12. Select ‘reboot system now’ and wait for the smartphone to perform its first boot process with the CM 10.1 ROM.
  13. Enter your Google Account details when the home screen appears.
  14. Take control over your device and start testing all the new functions and features of the CyanongenMod Jelly Bean 4.2.2 operating system.

NOTE: if the first boot process doesn’t complete after 10 minutes have passed, then you will have to remove the phone’s battery. Then, re-insert the battery after 5 seconds have passed. Repeat the entire tutorial starting with step 6, only that this time you will need to apply the actions listed under step 8 and factory reset your Galaxy S4 T-Mobile. Such custom ROMs might not install at your first attempt, which is you need to try a couple of time if it fails the first time.

These were all the steps that you had to go over in order to flash a brand new CM 10.1 Nightly build for your Galaxy S4. Make sure to customize all the screen and parts of your OS, so that you’ll add better functionality and accessibility to your Android environment. Remember that this ROM supports toggle customization, tons of widgets for your phone’s lockscreen and numerous other new tools.

However, there might be some of you who don’t like how this new ROM works with your phone, which is why you had to create a NANDROID backup using the CWM / TWRP Recovery Mode. Use the same custom Recovery mode and restore your device to its previous ROM, as the process shouldn’t take long to complete.

If you do like the CM 10.1 Nightly build and how your T-Mobile Galaxy S4 works with it, then you should know that you can keep updated by going through Settings > About phone and then checking the CyanogenMod Updates menu. If you have any other questions, please use the field below.