MStar firmware packages usually adhere to a specific structure. Inside a typical update ZIP file, you will find:
Key Partitions:
Most Mstar firmware updates come as a single .pkg file (e.g., update_msd638.pkg). This is not a standard Android system.img. Instead, it is a proprietary Mstar container that holds: mstar android tv firmware tools repack
To successfully repack Mstar firmware, you need a specific suite of tools. The keyword here is not just "repack" but the correct tools. Below is the industry-standard collection:
Mount and edit:
mkdir sys_mount
sudo mount -o loop system.img sys_mount
# Remove bloat, add files
sudo umount sys_mount
Then repack to sparse image:
img2simg system_ext4.img system.img
If you have a .zip file, extract the contents to a folder. You will likely see a file named MstarUpgrade.bin or similar. If you have a raw NAND dump (backup), you are already halfway there. MStar firmware packages usually adhere to a specific
MStar boot images do not start immediately with the Linux kernel. Instead, they begin with the MStar Header. This structure contains:
When a standard tool like mkbootimg is used, it strips this proprietary header, rendering the image unbootable on MStar hardware. Key Partitions: Most Mstar firmware updates come as
| Issue | Solution |
|-------|----------|
| TV won't boot after flash | Never change partition sizes. Repack with exact offsets. |
| "Signature verification failed" | MStar does not enforce signature on USB .bin (only on OTA zips). |
| Tool detects wrong chip | Edit config.ini inside the tool folder. |
| Repacked file size mismatch | Add padding to match original block sizes (e.g., 64KB alignment). |