*** YOU NEED TO REGISTER ON THE FORUM BEFORE YOU CAN ACCESS THE DOWNLOAD LINK ***
INSTALLATION INSTRUCTIONS
http://www.xperiablog.net/2015/03/17/guide-to-installing-xperia-lollipop-using-xperifirm-and-flashtool/
- Open link above and skip to the section entitled “FlashTool steps”.
- As you have already downloaded the FTF firmware file, skip to the section where you need to “Flash device”.
XPERIA FIRMWARE DETAILS
This is official stock Sony Xperia firmware.
Model: Sony Xperia Z Ultra (C6802)
Firmware version: 14.6.A.1.236_R3D
Region: India (Generic) [1274-8736]
Android version: 5.1.1

Xperia Z Ultra_C6802_14.6.A.1.236_India_Generic 5.1.1
Sony Xperia Z Ultra (C6802) Android 5.1.1 firmware - Generic India