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This is the critical step where most users fail.
MCODE648 or MSTAR_T2). This is the #1 cause of repack failures.my_custom_firmware.pkgExtract boot image
Extract system/root filesystem
Make your changes
Repack ramdisk and boot.img
Recreate rootfs image
Rebuild update package
Flash / test safely
| 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). |
Even with the right mstar android tv firmware tools repack, things go wrong. Here is the diagnostic guide: mstar android tv firmware tools repack
| Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| TV shows "Update package corrupted" | CRC mismatch or wrong encryption key | Re-extract with correct tool version; ensure you used the same key for repack |
| TV flashes but boot loops at logo | system.img size > partition size | Shrink your modifications or use mksquashfs -no-duplicates |
| "Signature verification failed" | Stock bootloader is locked | Use UART method or find an engineering bootloader |
| Tool crashes when loading PKG | New encryption algorithm (post-2023 models) | Wait for tool update; extract manually via Python scripts |
| System boots but WiFi/BT dead | You overwrote vendor.img or config.img | Never modify vendor unless necessary; repack with original vendor image |
Some newer MStar firmwares (T36, T38, Android 10+) use AES-128-CBC encryption.
You’ll need:
Without keys, repacking is impossible.
Once all partitions are modified and verified:
