I can't activate my iPad. Everytime i try to, this is the answer i get: Your iPad could not be activated because the activation server is temporarily unavailable. Try connecting your iPad to iTunes to activate it, or try again in a couple of minutes.

I've been trying to activate it through the day and i cant seem to get it right. I know it says it is a problem with the activation server, but my brother activated his iPad just fine. This one I'm using (or at least trying) had the iOS 7, a beta version, I guess.. I don't know if it has anything to do with the problem, but i thought I might say it. I also tried to sync it with my MacBook and restore it but it says there's an error and the resource I'm asking for is not found. Help, please!

Thank you