Androidbiits.com brings an amazing news for T-Mobile Samsung Galaxy S3 SGH-T999 users. According to matrixzone, CM12.1 [d2tmo] unofficial ROM is released for T-Mobile Samsung Galaxy S3 SGH-T999. Recently, I have written the step-by-step instructions for updating S3 SGH-I747 to Lollipop 5.1 using CM12.1 [d2att]. Now, the amazing news is that SGH-T999 users can test CM12.1 [d2tmo]. Today, I will post the simple instructions for updating T-Mobile Samsung Galaxy S3 SGH-T999 to Android 5.1 Lollipop via CM12.1 [d2tmo]. This is really an amazing news for SGH-T999 owners who are bored with KitKat and waiting to test Lollipop on SGH-T999.

I am expecting that T-Mobile S3 SGH-T999 users will be able to install Android 5.1 via CM12.1 [d2tmo] safely without facing issue after reading the steps written in Androidbiits.com. CM12.1 [d2tmo] requires rooted SGH-T999, so it is important to root SGH-T999 before installing CM12.1 [d2tmo]. The key thing is CWM recovery installation on SGH-T999 before installing CM12.1 [d2tmo]. Oh yes, I forgot to say that you can perform all these works after unlocking SGH-T999 bootloader.

Androidbiits.com recommends that T-Mobile S3 SGH-T999 users must take a backup of their data including videos before installing Android 5.1 via CM12.1 [d2tmo], as there is a chance of data loss from their SGH-T999. If you are waiting for Lollipop 5.1, then you must try CM12.1 [d2tmo] on your SGH-T999. Oh yes, the important thing is that CM12.1 [d2tmo] will allow you to enjoy Lollipop 5.1 on SGH-T999. CM12.1 [d2tmo] is available for ROM lovers who love to test new ROM on their SGH-T999.

Below are the step-by-step tutorial using which you can install CM12.1 [d2tmo]. Androidbiits will not take responsibility if SGH-T999 got corrupted during the installation of CM12.1 [d2tmo]. SGH-T999 battery level must be more than 96% before following this tutorial.

How to Install Android 5.1 Lollipop CyanogenMod 12.1 [d2tmo] Custom ROM on T-Mobile Samsung Galaxy S III SGH-T999 [Tutorial]

1. It is the time to download CM12.1 [d2tmo] for your phone.

2. It is the time to download Gapps for SGH-T999.

3. It is the proper time to activate USB debugging.

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

5. It is the time to send CM12.1 [d2tmo] to SGH-T999.

6. It is the time to switch off SGH-T999.

7. It is the proper time to remove the USB cable from SGH-T999.

8. It is very crucial to put phone into Recovery Mode.

9. It is the time to click “wipe data/factory reset” on SGH-T999.

10. It is the time to click “wipe cache partition” on SGH-T999.

11. It is the time to click “install zip from SD card” for installing CM12.1 [d2tmo] on SGH-T999.

12. It is the time to select CM12.1 [d2tmo] on SGH-T999.

13. It is the time to install CM12.1 [d2tmo] on SGH-T999.

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

15. It is the time to click “reboot system now” on SGH-T999.

16. It is the time to wait until phone reboots.

After your T-Mobile S3 SGH-T999 is rebooted, you can test CM12.1 [d2tmo] on SGH-T999. If you are experiencing difficulty while installing CM12.1 [d2tmo] on SGH-T999, then don’t hesitate to share your issue with Androidbiits.com.