On certain newer devices at the time, such as the iPhone 3GS with an updated bootrom, Blackra1n introduced the concept of a tethered jailbreak . This meant that if the device was powered off, it required a connection to a computer running the Blackra1n software to boot back into its jailbroken state. The Quest for Linux Compatibility
: A built-in option to unlock the baseband for use with different carriers. Tethered Jailbreak blackra1n linux