How to update to ios 7 beta 2?

Ok so i'm currently on 6.1.3 software on my iPhone 4 and i was wanting someone to help me (it does not have a sim card slot)

You need to make sure your device's UDID is registered with http://www.instantudid.com/, or you won't be able to activate the beta. It's $5 and they did mine instantly.

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