Hello, like an idiot I downloaded and installed 3.1 beta 1 to my 3G iPhone (not jailbroken). I am not a registered developer.
I then tried to go back to 3.0 and during the process it seems to have locked my iPhone as I can't restore it - I keep getting a screen on iTunes telling me I need to register the phone as a developer.

Can anyone tell me what I can do just to get my phone working?

I have the 40 Digit number needed to register it as a developer - is it worth paying the $99 to register as a developer and sort it out or is there an easier way? - I just want my phone to work, I did a backup yesterday before all of this so all my info is on my iMac.

Any help would really be appreciated

Shaun

No need to pay.

Put the phone into DFU and them restore with a custom IPSW of 3.0.

I'm using iphone too but I don't have problem like u.
everyday I always research about iphone. i saw u wanna downgrade your iphone 3.1 to 3.0 right? I thing this web
Downgrade iPhone 3GS 3.1 to 3.0 OS Firmware | About Online Tips
maybe it can help u. B4 u do it please read be carefully because i never do it b4.