Arduino Uno R4
Important
This board is unsupported. Consider a Mega 2560 Pro Mini instead.
The Arduino Uno R4 is an Arduino board based on the Renesas RA4M1 microcontroller. While it bears the Arduino Uno name and is prominently featured on the Arduino website as the successor of the Arduino Uno R3, the fact that it uses a different microcontroller than the latter makes it incompatible with MobiFlight firmware. Arduino’s advertised sketch compatibility applies only to Arduino sketches the user builds in the Arduino IDE, not pre-made firmware images like MobiFlight.
The Arduino Uno R4 comes in two variants, Minima and WiFi. Both are incompatible with MobiFlight firmware.