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Unfortunately - only a Bocsh-certified bike shop. And when I watched them do my update we couldn't determine what changed - other than "updates and fixes"

I've got a 2019 Kona Mountain Bike with the Bosch Purion / 500wh battery / Performance Line CX (20mph) drivetrain - just bought last week (last years model / great deal!!) and determined I was several firmware revisions behind of each of the 3 components. Searched and searched on Google, this...