[Revised] How to use SP Flash tool to flash Mediatek firmware

Using a low-quality or incorrect scatter file for the MT6768 can lead to:

partition_index: 1 partition_name: pgpt file_name: NONE is_download: false type: NORMAL linear_start_addr: 0x0 physical_start_addr: 0x0 partition_size: 0x80000 region: EMMC_USER storage: HW_STORAGE_EMMC boundary_check: true is_reserved: false operation_type: INVISIBLE reserve: 0x0