My iPhone is stuck in recovery mode and is uneligible for the restore?

Back at the start of Summer I updated to iOS 6 beta without being a developer, all was grand until this morning (1/10/12) were when I unlocked it, it requested verification.

Of course I couldn't do that and so tried a restore, wiped it, restore again, and then I put it in DFU and tried to restore again. I've downloaded iOS 6, 3 times now! None of these worked, and I keep getting the message -

'The iPhone "name" could not be updated. The device isn't eligible for the requested upgrade.'

I don't know what to do now. Everything is up to date.

I'd appreciate anything anyone has to say!

Thanks!

Added (1). I've realised what's happened.iOS 6 beta 4 expired yesterday (30/9/12) and I stupidly didn't update to the Gold release so now I'm stuck on a screen that asks for developer verification. Is there any way of getting around this, without having to pay $99 to register as a developer?

Try putting it back to 5.1.1