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Finally managed to do calibration (on the Windows version of Zwift!). The link below gave me the hint that you need to go much higher in speed than what the screen shows, when going up to around 55kph the Zwift screen finally showed me that I could stop pedalling and then calibration succeeded. Tuo ...

I have exactly the same problem. It doesn't work in Zwift (it just "hangs" in step 3, "keep spinning at 37kmh), but also not in myETtraining app (I tried both Windows and Android, both ANT+ and Bluetooth connection). In the app, sometimes it just hangs on start pedaling, sometimes it ...