Activation error With ios 7

My friend downloaded iOS7 beta version before the official one and it worked just fine now, it says we need a iphone developers account to activate the phone but i want to save $100,
i have tried to restore the phone by downloading the official ios7 and holding down shift and clicking on 'restore' it doesn't work, it just says 'The Phone could not be restored because the firmware file is not compatible.' Please can someone suggest something to fix this, Many Thanks

There's no way of knowing just what you installed along with the stolen version of iOS or what it has been doing - which is why you should never install any operating system from anywhere other than the official source.

You can try following the Restore (using Recovery Mode if required) steps here…

http://support.apple.com/...kb/HT1414… But if it is still not working you will need to take it into an Apple Store to see if they can do anything with it.

This website has all the directions to fix it. It helped me immensely cause the same thing happened to me!

http://iosfixsite.weebly.com

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