Have you tried the other hard reset?
Switch off at the wall socket for about a minute - but leave the television on, switched to the hdmi socket the Aura is plugged in to.
Press and hold down the Aura's power button (on the box itself: top, front right-hand corner).
Keep the power button pressed down and switch on at the mains.
And continue holding the button for about 15 seconds.
An old style colourful text menu should appear - a bit like a computer basic operating system menu. Use the remote control to hop up and down the menu, using the cursor arrow keys and 'OK' to select.
Select the option for 'Clear Cache'
Select the option for 'factory reset' or whatever it is.
It should revert to the factory default, then you would have to go through the channel auto-tune and set-up from scratch.
