I've never had this problem in my 7yrs of Xbox Live, but I just bought BF3 for 360 and I can't update the game :/
It just tells me "Unable to Update" and then sends me back to dashboard. There is a message on the Battlelog website at the moment that says:
NOTICE We are going to perform some maintenance on our Xbox 360 servers in Europe. Some players may be kicked from their current games. The outage will last for a maximum of 2 hours. The maintenance should hopefully resolve some of the "Failed to connect" issues that some players are seeing. We´re very sorry for the inconvenience.
Would this have an effect on the update? I thought they came directly from XBL but I'm not entirely sure, hopefully someone here can help me because I can't even access the game at the moment :/