Drag and drop your converted boot.img onto the unpackimg.bat (Windows) or run ./unpackimg.sh (Linux).
: This is a raw image dump of your device's boot partition, created by TWRP.
Use an extraction tool like (Windows) or The Unarchiver (macOS). Extract the contents of the archive.
Look for the magic number ANDROID! (ASCII) at offset 0x0000. If you see 41 4e 44 52 4f 49 44 21 , then your file is already a valid boot.img . Just rename it: boot.emmc.win to boot.img
Here’s a concise review of the process and tools for converting boot.emmc.win (a TWRP backup of the boot partition) to a standard boot.img (flashable via fastboot or other tools).
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mkbootimg --kernel boot.emmc.win-kernel \ --ramdisk boot.emmc.win-ramdisk.gz \ --cmdline "your_cmdline_from_unpack" \ --base 0x80000000 \ --pagesize 2048 \ -o boot.img
file boot.img
To root modern Android devices, you must patch the stock boot image using the Magisk app. Magisk requires a standard .img or .tar format. By converting your TWRP backup to boot.img , you can copy it to your phone, patch it via Magisk, and successfully obtain root access. 2. Fastboot Flashing Extract the contents of the archive
If you're working with a specific device, check the device's forums or documentation for the recommended method of conversion or available tools.
cat boot.emmc.win* > boot.emmc.win_full
Now that you have a standard boot.img file, you can use it for standard Android modification workflows: 1. Patching with Magisk for Root Access
from stock firmware. For a Samsung Galaxy S9 (SM-G960F), boot.img is exactly 37859328 bytes. The TWRP backup boot.emmc.win is larger by 4096 bytes.