How To Update T-Mobile Galaxy S3 To Android 7.1.1 Nougat OctOS Custom ROM

Good news for the Samsung T-Mobile Galaxy S3 users, because Android 7.1.1 Nougat is now available via OctOS custom ROM for Galaxy S3 SM-T999 variants. Galaxy S3 will not receive the official update from Samsung but thanks to the OctOS team to provide Android 7.1.1 Nougat for T-Mobile Galaxy S3. The OctOS team always build very stable and reliable custom ROMs, and you should test one on your T-Mobile Galaxy S3. This latest custom firmware brings the latest Android 7.1.1 exclusive features and changes. Also, this custom firmware comes with some aftermarket features. This is not officially announced by Samsung but just a custom ROM that’s why you may face some minor bugs and not functioning features but do worry about it. These bugs will be completely rectified in the final release.

By following this simple step by step guide, you can install Android 7.1.1 Nougat OctOS custom firmware on T-Mobile Galaxy S3 SM-T999. Your device must be rooted and installed with the latest recovery like TWRP or ClockwordMod (CWM). Because OctOS custom ROM required a custom recovery to flash the ROM on Galaxy S3. Before proceeding, keep in mind to take a full backup of all your valuable data. If you are interested in updating your T-Mobile Galaxy S3 to Android 7.1.1 Nougat OctOS custom ROM, then go ahead and follow the given steps.

How To Update T-Mobile Galaxy S3 To Android 7.1.1 Nougat OctOS Custom ROM 1

Android 7.1.1 OctOS Nougat Custom Firmware Features:

  • Substratum theme engine!
  • Tentacles settings!
  • Pixel Launcher
  • KernelAdiutor-Mod
  • SuperSU
  • Power menu options
  • Screenshot
  • Screen record
  • DPI settings
  • Status bar time and date options
  • Status bar network traffic indicator
  • Status bar notification settings
  • Quick tile settings
  • Many quick tiles including Tentacles and KernelAdiutor-Mod
  • Volume button playback control
  • Volume button wake


The OctOS Android 7.1.1 custom ROM and instructions given in this guide can be used only for the T-Mobile Galaxy S3. Check the model number of your Galaxy S3 from Settings > About Phone.

Warning: will not be held responsible for any kind of damage occurred to your T-Mobile Galaxy S3 during or after the installation of OctOS Android 7.1.1 ROM. Proceed at your own risk SM- T999.


  • Create a proper backup of all your existing data and settings on the phone before moving on to the installation guide using a recommended custom recovery.
  • Enable USB Debugging Mode on the T-Mobile Galaxy S3 by navigating to Settings > Developer Options.
  • Verify that you’ve correctly installed the Galaxy S3 USB Drivers
    on the PC.
  • The Galaxy S3 should be rooted with the latest version of the custom recovery like CWM or TWRP installed.
  • The bootloader of your S3 must be unlocked.
  • Make sure that the battery level of the Galaxy S3 is at least above 80% before going ahead.

Required Files:

  • Download OctOS Android 7.1.1 ROM

Steps to Install Android 7.1.1 OctOS Nougat Custom ROM on T-Mobile Galaxy S3:

Step No 1: – First, download OctOS Android 7.1.1 custom ROM for T-Mobile Galaxy S3  on the desktop of the PC.

Step No 2: – Plug your device to the PC using its USB data cable and mount its USB memory storage.

Step No 3: – Transfer OctOS Android 7.1.1 ROM .zip file which you’ve already downloaded from the above link to the root folder of your SD card on the phone.

Step No 4: – Unplug the Galaxy S3  from the PC and power it OFF to boot into Recovery Mode.

Step No 5: – Power ON the device while pressing and holding Volume Up + Home + Power buttons at the same time to enter into Recovery Mode.

Step No 6: – While your device is now in CWM Recovery, perform wipe data/factory reset, wipe cache partition and wipe dalvik cache also by navigating to Advanced > Wipe Dalvik Cache.

Note: – wipe dalvik cache will help you to prevent boot loops and other errors during ROM installation.

Step No 7: – Go back to the main Recovery Menu and choose install zip from SD card → choose zip from sd card.

Step No 8: – Navigate to the OctOS Android 7.1.1 custom ROM .zip file which you’ve already transferred to the SD card of your device previously. Select the ROM .zip file using the Power button and confirm the installation to begin.

9: – Navigate to +++++Go Back+++++ once the installation is completed. From Recovery Menu, reboot your device by selecting reboot system now.

Your Galaxy S3  will be reset and may take about 4 to 5 minutes to boot for the first time after installation.

Done! You’ve successfully updated T-Mobile Galaxy S3 to the latest OctOS Android 7.1.1 ROM.


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