From OTA. Android 4.3 – 3.24.531.3
New T-Mobile RUU Added | 3.24.531.3 - HTC1Guru
Firmware/Radio update only >> http://forum.xda-developers.com/showthread.php?t=2355814
New T-Mobile RUU Added | 3.24.531.3 - HTC1Guru
Firmware/Radio update only >> http://forum.xda-developers.com/showthread.php?t=2355814