Help can't update software

[aa777rob]

i was told there are several updates that i'm behind on, but when i go into my settings and software, try to update, click to update, i get an ERROR, says "server unavailable" i tried connecting thru wifi, still no luck. only update i saw online from ATT was a gingerbreak update, it warned me if i installed it, it would erase all the data on my phone. am i missing something? help! thanks to all.