*** 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 M5 Dual (E5663)
Firmware version: 30.1.B.1.46_R3A
Region: Thailand (Generic) [1297-3368]
Android version: 5.1

Xperia M5 Dual_E5663_30.1.B.1.46_Thailand_Generic 5.1
Sony Xperia M5 Dual (E5663) Android 5.1 firmware - Generic Thailand