flukesy, yes you can. I installed beta 2 on my 4S last night. After updating and trying to restore my data it got stuck on the Apple logo and kept restarting and just wouldn't get passed the Apple logo. I restored back to 6.13 fine though.
Anyway I read it was because I needed to erase all settings and disable Find My Iphone on 6.13 before updating to beta 2. Did that and it worked fine the second time.
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