Software? perhaps they didn't have it complete before the sets came out,bit puzzled as to why they go through so many software upgrades,the HD Freeview box I mention above the four channels that transmit in HD from the terrestrial transmitters were fine but the standard freeview off air picks were rather poor ,one day I switched it on and it was downloading new software and that improved those pictures 100%
Today I have to find the original 3.55 firmware and and flash the set back up from version 3,15,apparently that is the best thing to do and the USB input will remain enabled,