The EXR (Extraordinary Xperia Romer Group) on XDA-Developers posted something unusual hours back that looks like the OTA update for the Sony Xperia TX LT29i and has the build number 9.2.A.1.131. The group calls it as a leaked version that Sony will be pushing out to the device Over The Air in the coming days. Also, any Android 4.3 firmware for this build number is not listed on PTCRB website. However, users who installed this ROM have claimed that the ROM works pretty well on their Xperia TX. While we are unsure if this is the official version Sony will roll out, it is up to you to try out the ROM.
The ROM has a kernel.elf file inside which means you need an unlocked bootloader to install this ROM. You can unlock it from unlockbootloader.sonymobile.com
Users have reported that the ROM has Sony’s Smart Social camera and Xperia Themes which have been seen in the recently leaked Android 4.3 firmware for the Xperia T and Xperia SP.
To install this ROM, you need a rooted device with CWM installed. To install it, simply wipe data, cache and dalvik cache from recovery mode. Flash the ROM zip file after you make these wipes.
In case the ROM doesn’t get flashed, you can extract the kernel.elf file from the ROM zip file and use the command fastboot flash boot kernel.elf to flash the kernel separately from fastboot mode. To learn more about ADB commands, read about Minimal ADB & Fastboot installer.
If you face any issues, feel free to comment below or refer the original thread.