by wwguy » Tue Jul 30, 2019 7:11 am
I just discovered that mine does the same thing, so I don't think yours is malfunctioning. (Although the original problem you reported seems like a malfunction.)
The inability to get the new odometer value to stick might be to lack of the 3rd button shown in the video, but I think it's probably more likely that Beta requested that they lock out this feature due to use as an OEM odometer. But I'm just guessing.
I also just discovered that in tinkering with mine yesterday that the total miles and ART have both reset to zero and I can't change them. It's no big deal for me because this is my second speedometer (the first failed early on due to water ingress) and I only have it installed on the bike for part of the year (in the summer I carry a chainsaw over my front forks and have to remove the speedo for fitment.)
IMHO this speedometer, and the newer Facomsa version on the 2017+ bikes too, are cheap junk prone to water damage, breakage, frequent backup battery failure, and issues like what you're experiencing. For reliable maintenance interval tracking I rely on an inexpensive self-powered aftermarket hour meter with a 10-year lithium battery.