If you, like me (3GS) Vodacom SA, are getting a lot more dropped calls on your iPhone since upgrapding to 4.01 and want to revert back to 4.0 visit:
http://www.felixbruns.de/iPod/firmware/
There is a link to download to the ipsw file for your phone. It comes from the apple server, so it's safe.
On Mac:
Hold the option key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
On Windows:
Hold the SHIFT key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
Subsequently, a dialog box will come up which will allow you to select the firmware file to use for your update. At this point, simply browse to and select the firmware file that corresponds to the version you'd like to restore your iPhone with.
http://www.felixbruns.de/iPod/firmware/
There is a link to download to the ipsw file for your phone. It comes from the apple server, so it's safe.
On Mac:
Hold the option key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
On Windows:
Hold the SHIFT key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
Subsequently, a dialog box will come up which will allow you to select the firmware file to use for your update. At this point, simply browse to and select the firmware file that corresponds to the version you'd like to restore your iPhone with.
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