I just picked up the JDrones UC4H Starter Combo. I had success flashing the nodes with firmware except the gpsmagbaro (using the instructions in CANbus Quadcopter using UC4H : Son of FrankenSolo, Thanks!). This always results in a “ERROR (2)” under node health. I tried this on multiple nodes as well as trying older firmware (0.27) but no luck.
Edit: This is normal behavior when a mag or baro is not found.
By setting parameters you can control what is attached. GPS alone, GPS with MAG or GPS, MAG and BARO. It will give you an error if you specify more than you actually have connected. It defaults to all three.