Have you used the flash tool lately? The elite series 2 is supported in the latest firmware, this is a manual update that uses a PC or Mac. You can find the latest firmware below. Please read the instructions on the download page.
http://xim.tech/latestOtherwise it will help to know if the controller is initializing with direct connection to APEX, this is needed for your mouse and keyboard to work later. To do this, please remove the hub and then disconnect and reconnect APEX to the console with the controller directly connected to APEX while watching APEX's startup light sequence. Do you see 4 green lights during this sequence? For reference the startup light sequence should look similar to this:
red, green, blue
red
green, green, green, green
red
If you do not see 4 green lights at startup and you have spare data cables it may help to test these spare cables with the controller.