The is a proof-of-concept for creating an invalid garmin firmware file (gcd) that can cause an crash. This is designed and tested on the device edge130apac but it may work on similar devices.

In regular updates, if the update file is present on the flash, the device prompts the user with the options Yes and No to update.

But the files generated by this project will cause a buffer overflow, that could result in arbitrary code execution. And this happen before the user is prompted, so as long the file is uploaded, the buffer overflow can be triggered.