A2B Ferber computer manual or how can I restore factory settings?

I need an instruction manual. Suddenly my bike behavior changed. When I'm stopped at a long traffic light I usually find my battery shutting off.

I might have caused this by accident. To power up the dash I need to press down the O button. If I hold it an instant too long, the computer comes up instead. Trying to turn it off, I evidently did something I should not have done. The owner's guide gives inadequate information, pretty much no information.

Additionally: The dash always showed trip mileage. It never showed total mileage. Anyway, when I got up to 1000 miles, it reset to zero where it now stays.

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