This has to be asked, are you using the up and down shift button when you go into manual, if so then the switch probably could use a good cleaning. Since we do not know how old the scoot is maybe it is just dirty from lack of use.
It has to be asked; have you or whoever pressed the D-M switch first to put the bike into manual, or are you just pressing the UP/DOWN buttons assuming that will put it into manual and execute a shift? :dontknow:
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