*** YOU NEED TO REGISTER ON THE FORUM BEFORE YOU CAN ACCESS THE DOWNLOAD LINK ***
Once you have registered you will be able to download the firmware by clicking on the orange "DOWNLOAD NOW" button.
Once you open the link, you will need the decryption key to access the firmware - hit the 'spoiler' below to show the key.
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INSTALLATION INSTRUCTIONS
http://www.xperiablog.net/2016/03/12/install-xperia-marshmallow-using-flashtool-and-xperifirm-guide/
- Download the FTF firmware file
- Ensure all drivers are correctly installed on your computer as highlighted in Part 1 of the guide linked to above
- Follow Part 3 of the guide to flash the firmware to your Sony Xperia device
XPERIA FIRMWARE DETAILS
This is official stock Sony Xperia firmware.
Model: Sony Xperia XZ Dual (F8332)
Firmware version: 39.2.A.0.386_R2C
Region: Middle East and Africa (Generic) [1305-0127]
Android version: 7.0

Xperia XZ Dual_F8332_39.2.A.0.386_Middle East and Africa_Generic 7.0
Sony Xperia XZ Dual (F8332) Android 7.0 firmware - Generic Middle East and Africa