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Now at my wits end. I had been having trouble with this bike because the pedal assist stopped kicking in and so changed the pedal assist sensor as advised. Nothing. Changed the controller as advised, still nothing. Any ideas or should I just give up?

I have an Usprite UM44 and bought a standard crank puller, but I don't think its the correct type as it has a round end and the crank looks square inside? Can anyone guide me as to what crank puller I need to buy? Thanks

I bought this bike second hand about 8 months ago, no manual and no key to remove the battery, but so far it has performed very well. Then last week the pedal assist just suddenly stopped working. It's fully charged and so I suspect a loose connection, but I don't even know where to start...