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Be very careful promoting "free downloads" for the Bosch Diagnostic Tool 3. The software is proprietary, and downloading "cracked" versions from file-sharing sites is illegal and can potentially damage an expensive eBike motor. The posts above steer the audience toward the legal free apps while explaining why the pro tool isn't available.
For deep diagnostics or repairs requiring the DiagnosticTool, the is the only solution. They will have the necessary licensed software and dongle. A typical cost for a diagnostic check is around £20-£40 , and it's often free if you're having other service work or buying parts.