Every MT6739 device has a unique scatter file. Using a file meant for a different model can "hard brick" your device, rendering it useless. How to Flash MT6739 Firmware (Step-by-Step)
The actual Android OS, apps, and user interface. mt6739 firmware
Firmware (often called a Flash File or ROM) is the operating system specifically tailored for your device's hardware. For an MT6739 phone, the firmware consists of several critical components: Every MT6739 device has a unique scatter file
Reviving a "dead" phone after a failed software update. mt6739 firmware
Open flash_tool.exe as an Administrator.