This specific file is for 1920x1080 (Full HD) panels.
Since firmware for these boards is often large, it is split into multiple parts (like "part2") to make downloading easier. Technical Overview: TP.MS338.PB801 Download MS338 PB801 1920x1080 Micromax Canvas part2 rar
Put all parts in one folder and extract part1 . It will automatically pull data from part2 . Format USB: Use a FAT32-formatted USB drive. This specific file is for 1920x1080 (Full HD) panels