Yes, it is beta. I am using it on ATT with my tmobile 8700g. I was not able to get my blackberry internet browser back after installing this beta. I have tried sending the service book and no luck. I guess there is no OS 4.5 specified version for 8700 yet. I haven't tried to back up my service book from 4.2.1's version and use it on this beta to test it out. Too much trouble to do so as I mainly use my 8700g to charge my curve's battery now. Once again, it is a beta, so I expect all bugs =)
BTW, I do think 8700 does show its age while using OS 4.5 (feature wise)
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