Subtle differences?

[racingfit]

Is there differences between hardware in BA's?
Is there a reason that units with the same software behave differently?

[jakubd]

Reading information from many sources i came onto:
1. For sure there are 2 types of displays, that are not interchangable
2. Baniaczek came onto WiFi driver, that has problems on some versions od BA, and on other works perfectly. I had to change wifi driver in his R2 edition, because I could not log into my wifi network.