Contacting your seller or usb loading is what it seems to need. If you do try to load recovery files through usb make sure there will be no interruption while transferring. A power glitch or static spark could ruin the stb. You will most likely get 2 tries but might not..
I did some reading the other night about usb loading and you need to format your usb and have directories on there just as it says to, follow it to a t.
Or, you could leave it as it is since it's working- just a thought