I suggest to create a website and put the latest firmware. In this case no need to download the latest SW and copy to the USB drive and update it to the receiver.
There is an optinon under internet menu: update sw via FTP or HTTP.
I'm not sure about update by internet whether it is determined by the software restriction that should be done by the manufacturer only.The other way,there is time-bomb to prevent cloned-products.So it's better to update by USB