The Scooter mode works the TWN firmware only. Not even on the other Asian firmwares. There may be other ways to enable it on the Zumo 500/550, but I do not know it. It could be by modifying the firmware or changing the NVM, but in both cases it has to exist already in the firmware. If this is not a feature of your Zumo 500/550, then there is nothing I can do.
Edit: I checked you Zumo 550 v440 firmware and I could not find anything to help you.
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