The system requires two components: the and the hardware interface (the physical cable and dongle that connects the eBike to a computer via USB). Is There a Free Download Available?

Bosch only grants access to bike shop technicians who have completed official training modules.

While the full is reserved for professionals, Bosch has introduced incredible tools for everyday riders who want to stay connected to their bikes.

However, the reality is more complex. In this article, we’ll explore whether you can actually get the Bosch Diagnostic Tool 3 for free, the risks of trying to bypass official channels, and the legitimate (and safe) ways to access diagnostic functionality for your Bosch eBike system.

: Changes riding modes, adjusts support levels, and tunes dynamic response.

: View usage data, service intervals, and battery status.

: Installing the latest firmware to the Drive Unit, battery, and display. Fault Analysis

Use your smartphone as a digital key (eBike Lock feature).

Here is the most important technical fact: Bosch Diagnostic Tool 3 requires a proprietary USB interface cable—the Bosch DiagnosticsAdapter 3 (also called the BSA 3 or USB dongle). This adapter contains its own microcontroller and security certificate that authenticates with the software. Without this physical dongle (which costs €250–€400 from official distributors), the software won’t connect to any eBike.

: Unlike previous versions, Tool 3 is the exclusive interface for Bosch’s "Smart System" components, including the Performance Line CX (Gen 4) motors and the eBike Flow app ecosystem. Detailed Diagnostics

The Bosch eBike Diagnostic Tool 3 (often referred to as DT3) is the official software and hardware ecosystem developed by Bosch for their eBike systems. It is primarily designed for certified eBike dealers and professional technicians to interface directly with the eBike's motor (Drive Unit), battery, display, and sensors. With this tool, professionals can:

While the full "DiagnosticTool 3" software is restricted, that doesn't mean you have no control over your bike. The Bosch Smart System is designed to be user-friendly via the .

If you are a bike manufacturer or an authorized dealer, the software is provided officially:

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