I tried to update the firmware of my AVR-4308 from the internet and the connection failed 7 minutes before the end of the update. When I try again, it says that my firmware is the 'latest'. Can I really trust this, knowing that the attempted update mentioned 7 minutes left before it failed? I would be keen to re-do a complete update of the firmware, to be sure that it is up to date and accurate. Is there any way to enforce it?