I just bought a Pixhawk 2.4.8 B-Cube.
When I try to setup the firmware in QGC there is no option for anything like a B-CUBE.
QGroundControl tells me the device is a PX4 FMU v2.
EDIT:
As it tourns out, rebooting my computer and then choosing Pixhawk1 in QGC magically fixed this issue.