I could use some help. Error's everywhere I go.

[latormenta]

Have iTunes 11.1
On Beta 6.
It gives me the option to update via iTunes. Once downloaded, I get an error message about activation (assuming that is due to overloaded servers).

However, I also tried this:

I could use some help. On Beta 6, not a developer. iPhone 5 A1429, downloaded the iPhone5,2_7.0_11A465_Restore.ipsw which is the build of the GM/Public release right for my version correct?

So when I attempt to shift+update, I receive this message:

What do I do?