I've downloaded the IOS5 IPSW from Apple's site and want to update it from within iTunes. So,

  • Does the update require an Internet connection?
  • Does the iPhone switch off/reboot just as the update is initiated?

I ask because I'm at my new place where I'm yet to setup an Internet connection & my iPhone tethered to my laptop is my only Internet connection. I don't want my phone to be bricked because it cannot verify the update or what-not because there's no Internet connection.

  • Well, I'd be glad to test this in 80 minutes when my download finally finishes! Commented Oct 13, 2011 at 3:08

2 Answers 2


Yes it does. It has to verify the firmware with Apple's servers (gs.apple.com). If it cannot, it will error out (usually presenting a 3XXX error, which is quite often 3004) and fail to update.

  • The question really is: Does iTunes do this? Or does the phone? I neglected to test appropriately, so sorry, Sathya! Commented Oct 13, 2011 at 6:37
  • iTunes. It's your computer that checks for a connection (if you want to test it, enter gs.apple.com in your hosts file and try to re-install iOS). The iPhone is being prepped for loading, it can't negotiate any kind of connection at that point. So using it's network connection is a no-go. You need the actual computer you are using to load the firmware to have a working connection to the Internet.
    – user10355
    Commented Oct 13, 2011 at 7:04
  • @Sathya No problem. There is no way to bypass the server verification (TinyUmbrella may do it but it might also funnel it through its own server, so not local either). It's just one of the many checks Apple puts into iOS to ensure security (and prevent jailbreaking).
    – user10355
    Commented Oct 14, 2011 at 4:51

it does require internet. Just made the answer short.

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