In the EDU450 Carrier Board Document it says there is a 7V BEC but only a 5V is mentioned.
Are the Main and Aux rails 7V unless these solder pads are bridged as seen in here in the manual?
Seems this may be a documentation error ( but Cube Pilot should confirm!)
I would say WYSIWYG, so measure without the jumper soldered and if not 7v then add the jumper.