Arduino Micro and Pro Mini Firmata J5 troubleshooting
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If you have an problem when running Johnny-five with this boards, and you get an Device or firmware error its maybe a Board/Firmata misconfiguration.
To solve this before upload Firmata, search the following
Firmata.begin and replace the 57600 value for 28800, then upload the sketch and try to run Johnny-five and you shouldn't see any error message.