Read the question carefully. A tethered jailbreak is not permanent and the kernel has to be patched on every bootup (each successful bootup).
An untethered jailbreak is a type of jailbreak for iOS devices that is permanent and done once. The device to remain in a jailbroken state even after it is rebooted
Untethered Jailbreaking If user turns the device off and back on, the device will start up completely and the kernel will be patched without the help of a computer; in other words, the device will be jailbroken after each reboot.
An untethered jailbreak is a jailbreak wherein a user can reboot their device at will, and have their device start up with the jailbreak automatically applied without the assistance of a computer or a utility on the device.
Tethered jailbreaking involves patching the kernel during the boot process, meaning that after each reboot of the device, the jailbreak is lost, and the device must be connected to a computer to reapply the jailbreak. In this case, the device will only remain jailbroken if it's tethered to a computer during the boot process, which makes it less convenient because it requires manual intervention after every reboot.
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