*** 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 Z5 Premium (E6853)
Firmware version: 32.1.A.1.163_R8C
Region: Italy (Generic) [1299-1272]
Android version: 6.0

Xperia Z5 Premium_E6853_32.1.A.1.163_Italy_Generic 6.0
Sony Xperia Z5 Premium (E6853) Android 6.0 firmware - Generic Italy