Scan for channels and BBC1 will come back.
Updates are not worth installing, openatv release minor updates every day but none of them are of any use, if you want to keep it updated you have to go through the update procedure every day, if you haven't updated it for a few weeks then there'll be hundreds and attempting to install that many in one go will cause the box to crash and it will need flashing.
Ignore updates, it's easier to flash the box once or twice a year.