On this page, you will find the official Speed 9 Mini Firmware ROM (Flash File). The Firmware (Flash File) Package comes as a zip file and it contains the How-to Flash Guide, USB Driver, Flash Tool, and Flash File (ROM).
Speed 9 Mini Stock Firmware (Flash File ROM)
Firmware Name: Speed_9_Mini_MT6580_12262017_6.0.zip
Firmware Size: 798 MB
How to Flash