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Here is the step-by-step fix:
By following this guide—starting with the Telnet soft fix, moving to the BOOTP recovery, and ending with the battery replacement—you will successfully regain access to your M10. The "Open Menu" button will work, and your hardware will live to see another decade of service.
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.
In the context of the MOBOTIX M10, an "Open Menu" issue usually refers to one of three things:
The camera booted. The lens performed its start-up dance—a slow pan, a tilt, a refocus. The green LED returned. Klaus refreshed his browser.