You cannot use standard mkbootimg or ext4 tools directly. You need MStar-specific tools.
MStar firmware uses a header with CRC32 of each partition + a global checksum. mstar android tv firmware tools repack
(replacing boot logo, removing bloatware): ~70% Success rate for complex modifications (changing framework, adding kernel modules): ~30% (often requires manually fixing partition sizes and headers) You cannot use standard mkbootimg or ext4 tools directly
| 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 | (replacing boot logo, removing bloatware): ~70% Success rate
: Tools like aescrypt2 (often bundled with mstar-bin-tool) allow manual encryption and decryption of images once keys are extracted. You can verify a successful decryption of recovery.img by checking for the "MStar-linux(recovery)" string in a hex editor.