Whether you're restoring a device to factory condition or installing a custom ROM like LineageOS or AICP, the scatter file guides the flashing tool. ROM developers provide custom ROMs specifically for MT6582 devices, such as BlissPOP, Carbon LP, and AICP 11 based on Android Marshmallow. Each of these requires a compatible scatter file to flash correctly.
Check that you have extracted the firmware archive completely. The scatter file is always included in the same folder as other .img files within the ROM. If it's still missing, re-download the firmware from a different source. mt6582 android scatter file download