Do I need an internet connection to update iOS on my PC? 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 &amp; 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.
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.