Marbles' scale data and firmware updates

Just want to chime in here to say I had a similar issue with a used Marbles I got recently. In green and yellow X range modes I would sometimes get negative voltages. It must have been custom scales from the previous owner, since when I reloaded the firmware that issue went away.

Are you sure? Reloading the firmware does not do anything to user data (custom scales, calibration, settings…)

I didn’t realize that reloading the firmware would NOT reset the custom scales. I had assumed that since many of the scales on my Marbles were acting weird they had been overwritten. Maybe the person I bought it from had loaded a custom firmware with their own scales on it?

Technically, anything is possible with a custom firmware, but I’m not aware of anybody having developed one with hardcoded scales!