Mstar-bin-tool-master
To modify the system files, you must unpack the binary blob.
# Syntax: unpack.sh [input.bin] [output_directory]
./scripts/unpack.sh tv_firmware_v2.bin extracted_files/
This will create a folder containing:
Some firmwares use non-standard headers or custom Magic bytes. The tool may fail to detect partitions or misalign offsets, requiring manual hex analysis to correct.
MStar bootloaders often validate the CRC checksum of the firmware before flashing. If you modify bytes,
The mstar-bin-tool is a Python-based utility suite designed for unpacking and repacking firmware images (.bin files) for Android Smart TVs and other devices powered by MStar processors (now part of MediaTek). It is a vital tool for developers and enthusiasts looking to modify system software, port ROMs, or repair bricked devices. Core Capabilities
The tool acts as a bridge between the monolithic .bin firmware and its individual components:
Unpacking: Extracts partitions like MBOOT, boot.img, recovery.img, and system.img from the main CtvUpgrade.bin file.
Repacking: Merges modified components back into a flashable .bin format, ensuring the header and footer structures (like CRC32 checksums) are correctly aligned. mstar-bin-tool-master
Security Handling: Includes scripts like extract_keys.py to pull AES and RSA keys from the MBOOT partition, which are required to decrypt partitions on modern "Secure Boot" enabled MStar builds. Key Scripts and Their Functions
The "master" repository typically includes several specialized scripts found on platforms like Gitee or GitHub: unpack.py
The primary tool for splitting a .bin firmware into its raw partition files. pack.py
Reassembles partitions into a single firmware image, automatically generating the necessary MBOOT header script. extract_keys.py
Locates and saves encryption keys needed for signing and encrypting modified partitions. aescrypt2
A binary tool (often in a subfolder) used for the actual manual encryption/decryption of images. Basic Workflow Working with MStar firmware generally follows these steps:
Preparation: Install Python (3.8+ recommended) and place the CtvUpgrade.bin in a working directory. To modify the system files, you must unpack the binary blob
Extraction: Run unpack.py CtvUpgrade.bin [output_folder] to get the raw images.
Decryption (If Required): If the device uses Secure Boot, use extract_keys.py on the extracted MBOOT.img to obtain the AES/RSA keys needed to view the contents of boot.img or recovery.img.
Modification: Edit the system files or replace kernels using standard Android tools.
Re-assembly: Use pack.py to create a new flashable firmware, ensuring all 4-byte alignments and checksums are valid. Technical Structure The firmware .bin files consist of three main parts:
Header (16KB): A multi-line script containing MBOOT commands, ending with a % symbol.
Bin Body: The merged partition files, each aligned to 4 bytes and filled with 0xFF where necessary.
Footer: Contains magic bytes and swapped CRC32 checksums for both the header and the body to verify integrity. This will create a folder containing: Some firmwares
It verifies header integrity before unpacking and warns about mismatched CRCs. The repacking mode recalculates the correct header length and checksum – a feature missing from many generic tools.
python mstar_unpack.py firmware.bin output_dir/
mstar-bin-tool-master is a utility suite for unpacking, repacking, and modifying MStar semiconductor binary images (.bin, .img, MBOOT, MPOOL). Designed for embedded developers, firmware modders, and TV repair technicians.
MStar firmware images are notoriously difficult to modify because they use proprietary headers and specific memory alignment (SPI NAND/NOR layouts). This tool allows users to extract the bootloader, kernel, and root filesystem from a single .bin dump or create a flashable image from individual components.
Key Features:
Let’s walk through a complete project using mstar-bin-tool-master.
Goal: Replace the "BrandName" boot logo with a custom 1920x1080 image.
Caution: If the new logo exceeds the original logo partition size, you will corrupt the kernel. Always check sizes.