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And here you go official response from Speedbox. I will give it a try... Dear Ger, thank you for your message. The error 504 is connected with a countdown - if the countdown is not respected after each ride, then the error 504 appears. The countdown is only for the SpeedBox 3.0 due to the...

Thank you guys!. I will ask for the upgrade of firmware first. And will probably send an email to speedbox to see what do they recommend.

Thanks for sharing! Did you get it again or did you go with a different solution? I’m still with 1.0.2.0, where I also got the 504 with speedbox 3.0, and thinking about what to do. I also read that you can break the motor if you get 504 3 times, but not sure how true is that or just a rumor...