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Untethered jailbreak
Summary
An untethered jailbreak is a jailbreak where your device does not require you to reboot with a connection to an external device capable of executing commands on the device.
Device
All iPhone, iPod touch, and iPad models except the iPhone 4 have an untethered jailbreak, albeit not necessarily at the latest firmware.
Devices with a newer bootrom, which include some iPhone 3GS units, "MC" model iPod touch 2G units, iPod touch 3G units, and iPhone 4 units currently don't have a jailbreak for iOS 4.0. The iPad doesn't either, but iOS 4.0 isn't available for it.
Operating System
As of right now, there is no way to jailbreak the iOS 4 untethered on Linux-based operating systems. This can be done, however, with Mac OS X or Windows.
