To use the CROSSFIRE Micro Receiver V2, you have to use the expander board to easily get to the pins for
channel 1 and 2 required for CRSF communication.
In addition to the CRSF serial connection, you might want to connect BST (BlackSheep Telemetry) between
the CROSSFIRE RX and COLIBRI to provide extra telemetry and make changes remotely on the CORE PRO
(if connected) or FPVision (if part of the POWERCUBE).