最初試upgrade，但出現 error 3002，之後在mac forum看到以下方法… 現在試試…
好似風險不少…
I'm a paid Dev and I got the 3002 as well. I believe this is usually a provisioning problem, but my iphone/pad has been provisioned and worked for the previous 4.3 betas/etc. Neither are working now the 3002 error. I've tried a new provisioning profile without further luck.
But, I'm testing the theory that restoring the phone from the beta, rather than upgrading, may yet work. The rather large catch is that one should expect to lose everything and return to a factory install, with no gaurantees of restoring back to 4.x. Hmm... we'll soon see!
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The most surprising result...
So I chose the "restore" method (option-cmd restore) to upgrade to iOS 5beta. As expected, it installed fine, but to factory defaults. After a new iOS 5 setup screen it gave me the option to restore from backup, which I chose, just to confirm if there was an escape route left.
To somewhat of a surprise, it offered up my old phone's name as a restore option, and I chose it. It went through a long process and I expected my old iOS 4 phone to come back. But, it was still iOS 5. And the most surprising result was... It also had my old data (well, it remembered which apps to install, but had to reinstall them, and my desktop asked for my MobileMe Keychain approval for iTunes for the phone).
And the second most surprising result is... it's reinstalling the old apps (in their proper folders and arrangements, it appears) - in the background!?! I guess it's not actually over-the-air at this point, but it almost feels like it, as I can open the phone. It's a bit sluggish though, so I'll wait for the installs to finish and see if it's really the best result possible (iOS 5 beta with my old data... even rhymes).
Bryan
source: http://forums.macrumors.com/showthread.php?t=1164889
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發表於 8-6-2011 21:35:32
衰左。cake住了在 step 6: Triple click on the home button again and the Emergency Call screen will appear