The M10 has a small, recessed tact switch under the bottom casing (or near the SD card slot on flex versions). You will need a paperclip.
Here is the step-by-step fix:
This issue was particularly frustrating for users who relied on the camera for critical security applications. They needed to be able to adjust settings such as resolution, frame rate, and motion detection sensitivity, but were unable to do so. mobotix m10 open menu fixed
Mobotix released firmware updates (e.g., ) that: The M10 has a small, recessed tact switch