you can always download the update on your pc and then use a USB thumb drive to update the PS3
En México ya nos DESPEJAMOS!! <-- Local Joke
try the official playstation forums. Go in the technical discussion portion of it, they are sure to have the answer, if not you may have to call up Sony, but I won't be surprise if they tell you to call your network provider or something.
Just google Playstation forum
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Been playing alot of WarCraft III lately, anyone up for game? Just message me, my account is the same as here and GT.