Sony Xperia TX LT29 has reached end of life time and Sony has decided to end software support for that smartphone.
Sony Xperia TX LT29 has been announced in August 2012 as an international version of Japanese Sony Xperia GX Hayabusa. Sony has released two major firmware updates for that smartphone:
and the Android 4.3 Jelly Bean firmware is the latest one. Latest available software: 9.2.A.1.205. Don't worry, Sony Xperia TX LT29 just like most of Sony Ericsson / Sony phones is still supported in our Sony Ericsson Online Service and all firmware versions for that smartphone are available 
Source: Sony
