There are several reasons why you might need to convert boot.emmc.win to boot.img :
hexdump -C boot.emmc.win | head -n 2
If the file has a TWRP-specific header that prevents it from being recognized: Open the file in a hex editor (like HxD ). boot.emmc.win to boot.img
If that doesn't work, try skip=8 (for 4KB header): There are several reasons why you might need to convert boot
This command copies the contents of boot.emmc.win to a new file called boot.raw , using a block size of 1MB. using a block size of 1MB.