Were unable to complete activation on iphone 4s?

I had IOS 7 beta 3 on my phone but I had issues with my phone and verizon so in order to fix my issue thay asked me factory retore the phone. When I go to restore my phone, it woudnt restore so I restored it back to IOS 6.1.3, The issue was wit hthe cel towers being down in the area.

so I decided to go back to IOS 7. Now I'm stuck in activation issue on my phone.

NOW i followed the correct steps only to get when I go to downgrade back to ios 6.1.3, The iphone could not be restored. This device isn't eligible for the requested build. So I'm stuck in the activation screen and I can't get to my main phone to make calls. Help!

note the firmware that I'm using is that of 6.1.3 FOR the iphone 4s and it gives me that error message

Apple has discovered that you didn't register your UDID. You need to register your device's UDID immediately on a site like http://www.instantudid.com/ or risk permanently disabling your device.

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