One of the tools that can unlock IMG files is gimgunlock, which is a command-line tool that can decrypt the TRE sections of the IMG file, where the encryption key is also stored. By unlocking the TRE sections, the IMG file can be used on any device without needing to specify the device ID or map keys. The tool was developed by wuyongzheng, who also did some reverse engineering on the IMG format and the unlocking algorithm. The source code and the executable file of gimgunlock are available on GitHub. The tool is compatible with Windows and Linux operating systems.
To use gimgunlock, the user needs to drag and drop the IMG file over the icon of gimgunlock.exe, and the tool will create an unlocked version of the file in the same directory. The tool can also unlock multiple IMG files at once by selecting them and dragging them over the icon. The tool can also unscramble some IMG files that have been scrambled by a trivial XOR algorithm, which prevents them from working with other gimg* tools. To do this, the user needs to use another tool called gimgxor, which is also included in the gimgtools package.
gimgunlock is a useful tool for Garmin users who want to unlock their IMG files and use them on any device or with any software. However, the tool is intended for personal use only and not for commercial purposes. The developer of the tool also encourages users to buy Garmin maps if they like their products and services. Moreover, unlocking IMG files may violate Garmin's terms and conditions, so users should be aware of the potential risks and consequences before using the tool.
References:
: GitHub - wuyongzheng/gimgtools: Garmin Image Tools
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