Amazon.com: SPEEDBOX 3.0 for Bosch eBikes. Tuning kit Suitable for All 2014-2020 Bosch Motors Even of The 4th Generation. Smart Tuning chip of The 3rd Generation : Automotive
eBike Tuning SpeedBox 3.0 for Bosch Installation Instruction - YouTube
SpeedBox 2.0 for Bosch 2014 - 2018 Motors – Two Wheels Empire