The instructions were available Monday on the iPhone Dev Wiki, a Web site devoted to iPhone software hacks and tools.
Since the iPhone's launch, enthusiasts have been developing ways to allow the devices to run unauthorized software and to unlock them so that they can be run on any mobile network. Late last week, however, Apple cracked down on these efforts by releasing a software upgrade that made hacked iPhones unusable.
Since that release, however, hackers have been working on techniques that reverse the effects of this upgrade.
These latest instructions allow users to roll back their firmware upgrades and use some functions such as the phone's iPod and Wi-Fi capabilities, but they do not necessarily restore the phone's ability to make calls, according to the iPhone Dev Wiki. That's because hackers have not yet found a way to roll back the firmware used by the iPhone's baseband chip, which is used to make calls.
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