This happens when the partition layout of the new firmware is different from the old one. Change the dropdown from "Download Only" to "Firmware Upgrade."
A massive database for Chinese and budget handsets. mt6739 firmware
Moving to a newer Android version or returning to an older, more stable one. This happens when the partition layout of the
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: mt6739 firmware