Convert this to SP Flash Tool scatter format (or find a matching stock ROM).
. Using a standard or NAND-based scatter file on an eMMC device will result in a "Storage type mismatch" error in SP Flash Tool. How to Create or Get a Better Scatter File mt6577 android scatter emmctxt better
This error occurs when the preloader scatter address does not match the actual boot ROM base. Most MT6577 devices use 0x0 for PRELOADER. But some variants (Lenovo) use 0x200000 . A custom emmc.txt dump reveals the truth. Convert this to SP Flash Tool scatter format