*** 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 SP (C5303)
Firmware version: 12.1.A.1.207_R2B
Region: Australia (Generic) [1271-7710]
Android version: 4.3

Xperia SP_C5303_12.1.A.1.207_Australia_Generic 4.3
Sony Xperia SP (C5303) Android 4.3 firmware - Generic Australia