Advanced features include extracting encryption keys from MBOOT for secure devices.
Copy your CtvUpgrade.bin or MstarUpgrade.bin into this folder. Step-by-Step: How to Use the Tool 1. Unpacking the Mstar Firmware ( unpack.py )
After making changes, repack with:
If your firmware uses sparse images (common for Android 8+), the enhanced fork from sha-man-4pda will handle the decompression automatically. Standard mstar-bin-tool may not recognize sparse formats, leading to "no system.img/vendor.img" issues after unpacking.
Modifying and flashing firmware carries inherent risks, including the potential to "brick" (render your device unusable). The following risks are particularly significant: using the wrong firmware for your device can brick it; Secure Boot ensures only signed firmware runs, so a mismatch can prevent booting; corruption of the MBOOT.img (the primary bootloader) is often unrecoverable without specialized hardware. Also, incorrectly configured scripts can lead to a partial or failed flash. An incompatible checksum or CRC value can also cause boot failures. Dump Mstar Unpack Repack Tool
./mstar_tool repack -i system_mod -o new_system.img
Use commands like mmc read to copy partitions into RAM, and then use usb start and fatwrite to dump those memory segments directly to a FAT32-formatted USB drive. Phase 2: Unpacking the Firmware Bin File Unpacking the Mstar Firmware ( unpack
: Reassembles modified partitions back into a flashable firmware file using a configuration file (
If a device fails to boot due to a bad OTA update, the dump tool can extract a working image from an identical working device. The repack tool then allows you to flash that backup via USB or UART. The following risks are particularly significant: using the
This article provides a comprehensive overview of how to use these tools for MStar Android TV devices. What is the Mstar Unpack Repack Tool?
mstar_tool/ ├── mstar_tool.py # Main CLI ├── unpack.py # Header & FS extraction ├── repack.py # Reconstruction logic ├── crc_fix.py # Checksum patching ├── formats/ # Partition table parsers └── examples/ # Sample firmware + scripts