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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 including the iPhone 4 have an untethered jailbreak at the latest firmware currently available.
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 can't have a untethered jailbreak by PwnageTool, as they would need the signature checks patched since they don't have the 24kPwn exploit anymore.
However, it is possible to perform a untethered jailbreak on any device with any firmware version between 3.1.2 and 4.0.1 using Jailbreakme (This include any iPad models, running 3.2 or 3.2.1).
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.
