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I have an iPhone 4S and installed beta 1 but then I returned to iOS 6. If I want to install the beta 5 (without account) can I install beta 5 directly or I need to install beta 1 first?
 
I haven't heard any complaints so I guess it's safe. Apple doesn't do UDID checks with OTA updates so they wouldn't know you're not a developer.
 
Thank you! But I'm asking this because when beta 3 got out I tried to install it and then the activation failed.

Didn't have any activation issues at all. Just make sure you download the correct beta 5 version for your device. Issues usually arise with corrupted beta files or incorrect beta versions.
 
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