According to XDA member StealthBravo, Android 6.0 Marshmallow CM13 unofficial ROM is available for T-Mobile Samsung Galaxy S3 SGH-T999 [d2tmo]. It will let SGH-T999 users taste the tremendousness of Marshmallow 6.0 on T-Mobile S3 SGH-T999 [d2tmo]. All features may not work properly on T-Mobile S3 SGH-T999 as it is an unofficial build. Androidbiits.com has recently posted the step-by-step tutorial for updating Canadian Samsung Galaxy Note 3 SM-N900W8 to Marshmallow 6.0 using CM13 [Temasek's build v1.4]. The spectacular news is that SGH-T999 owners can now install Android 6.0 Marshmallow CM13 on T-Mobile Samsung Galaxy S3 SGH-T999 [d2tmo]. Isn’t it wonderful? Androidbiits.com will post the steps to update T-Mobile Samsung Galaxy S3 SGH-T999 to Android 6.0 Marshmallow via CM13 [d2tmo]. This is really a spectacular news for the owners of T-Mobile S3 SGH-T999. Oh yes, it is an experimental build, so you may face issues on T-Mobile S3 SGH-T999 after installing it.

I am hoping that you will be able to install Marshmallow 6.0 CM13 [d2tmo] on T-Mobile S3 SGH-T999 safely without having difficulty after reading the tutorial written in Androidbiits.com. CM13 [d2tmo] needs rooted SGH-T999, so it is crucial to root T-Mobile Samsung Galaxy S3 SGH-T999 before installing Marshmallow 6.0 via CM13 [d2tmo]. Well, SGH-T999 owners must install the latest TWRP on T-Mobile S3 SGH-T999 before installing CM13 [d2tmo]. Oh yes, the users of SGH-T999 can install CM13 [d2tmo] only after the bootloader unlock of T-Mobile S3 SGH-T999.

If you aren’t happy with old firmware, then you must install CM13 [d2tmo] on SGH-T999. The spectacular thing is that CM13 [d2tmo] will let you use Marshmallow 6.0 on T-Mobile S3 SGH-T999. Androidbiits.com recommends that SGH-T999 users must take a backup of their personal documents including contacts and games before updating their T-Mobile S3 SGH-T999 to Android 6.0 Marshmallow CM13 [d2tmo] as there is a chance of losing all data including contacts and games from SGH-T999.

Below are the steps using which you can install Marshmallow 6.0 CM13 [d2tmo] on SGH-T999. Androidbiits.com won’t take responsibility if SGH-T999 got corrupted during the installation of CM13 [d2tmo]. SGH-T999 battery must be more than 84 percentage before following these steps.

How to Install Android 6.0 Marshmallow CM13 Unofficial Custom ROM on T-Mobile Samsung Galaxy S3 SGH-T999 [Simple Steps]

1. It is essential to download Android 6.0 Marshmallow CM13 [d2tmo] ROM and GApps for T-Mobile Samsung Galaxy S3 SGH-T999 on your desktop.

2. It is the time to activate USB debugging on SGH-T999.

3. It is the time to attach SGH-T999 with desktop.

4. It is essential to transfer CM13 ROM and GApps to SGH-T999.

5. It is the time to power off your SGH-T999.

6. It is essential to remove the USB cable from SGH-T999.

7. It is the time to put T-Mobile Samsung Galaxy S3 SGH-T999 into Recovery Mode.

8. It is essential to tap “wipe data/factory reset” on SGH-T999.

9. It is the time to tap “wipe cache partition” on SGH-T999.

10. It is essential to click “install zip from SD card” on SGH-T999.

11. It is essential to choose CM13 ROM on your SGH-T999.

12. It is essential to install CM13 ROM on T-Mobile S3 SGH-T999.

13. It is the time to go to the main menu on SGH-T999.

14. It is essential to click “reboot system now” on SGH-T999.

15. It is the time to wait until SGH-T999 restarts.

16. You can also install GApps 6.0 on T-Mobile S3 SGH-T999 using the above steps.

After your T-Mobile S3 SGH-T999 is restarted, you can test Android 6.0 Marshmallow CM13 [d2tmo] on SGH-T999. Isn’t it spectacular? If you are having issue during the installation of CM13 [d2tmo] on T-Mobile S3 SGH-T999, then don’t hesitate to share your issue with Androidbiits.com.