An (not to be confused with standard .zip archives) is a proprietary, often encrypted or compressed binary package used primarily by certain Chinese mobile chipset manufacturers—most notably MediaTek (MTK) and Spreadtrum (Unisoc) .
| Offset | Size | Description | |--------|------|-----------------------| | 0 | 32 | Filename (null-padded)| | 32 | 4 | Offset in archive | | 36 | 4 | Compressed size | | 40 | 4 | Uncompressed size | | 44 | 4 | CRC32 |
But what exactly are these file types? Why would you need to convert between them? And what tools, techniques, and safety precautions should you know before attempting such a conversion?
A standard scatter file (used by ARMlink, Samsung’s Dyn.ini , or similar) defines load regions and execution regions.
Download a trusted open-source converter (e.g., ozip2scatter.py from GitHub), practice on a dummy Ozip file from a firmware archive, and learn to read hex dumps. Soon, you will move from confusion to confidence.
Move your target .ozip firmware file into this exact same folder. Step 3: Run the Decryption Script
or specific MediaTek decryption scripts are used to process the extracted files and generate the final MT67xx_Android_scatter.txt
A: OPPO/Realme updates their encryption keys periodically. If the tool is older than your firmware, it may not have the specific key for that model. You may need to update your decryption script.
If the scatter file is missing, you can use third-party tools like Miracle Box or the MTK Meta Utility . However, as noted by developers on forums, these tools often require a specific "DA" (Download Agent) file for the chipset to read the partition table. Simply having the .img files may not generate the scatter file automatically.
RW_IRAM1 0x20000000 0x00020000 ; execution region for RAM (size 128KB) .ANY (+RW +ZI) ; read-write and zero-initialized data