So I think that I can help ya with your questions. Don't worry its simple just fallow the instructions
First please reset the hub 3.0 box as this will get it to factory settings and then start the next step. Find out how to reset it properly here.
Third so to put it simple you can get maximum speed on 5 Gh, but on 2.4 Gh has a maximum speed of 70 Mb or so and more range from the point of origin.
Second, as now you have the hub at factory default use the instructions from my blog on how to actually do it, see here.
Also please let me know how it goes.
Here to help! I'm a technician helping out whilst working from home. Find out more