Just bought a new iPad 3G 64g recently, set it up with no problems, last night I was trying to install iOS 5 but have not manage to do so keep getting the "server unavailable" message. Have tried about 10 times with no luck, any tips?
Try downloading it from this site. You have to be on the latest iTunes (10.5.2).
On windows, press and hold shift while pressing restore and navigate to the file. On a mac, press alt(option) and hold while pressing restore and navigate to the file.