A scatter file is a text file that contains information about the layout of the firmware components on a mobile device. It is used by flashing tools, such as SP Flash Tool, to identify the correct locations of the firmware components, such as the bootloader, kernel, and system image, on the device's memory.

If your MT6769Z phone shows no signs of life (black screen, no vibration, not recognized by PC), the bootloader or preloader is likely corrupted. Using the correct scatter file, SP Flash Tool can force-write the boot chain back to the eMMC.

Before any flashing operation: