Originally posted by FoxCunning
I'm on iOS 10.1.1, and I have found out this "Semi Jailbreak":
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What is it? Is it secure? Is there a "risk of brick" or something like that?
Since there's a bit of a thing about semi-jailbreaks, I'll clear up exactly what they are, in context to standard tethered and untethered jailbreaks.
In the world of iOS jailbreaking there are three notable forms of jailbreak; tethered, untethered, and semi-tethered (or semi-untethered if you prefer).
Untethered jailbreaks are usually the most common form of jailbreak and take place as the phone boots up, putting it straight into the jailbroken state you know and love. An untethered jailbreak is one that is fully capable of being stored on the device and executed at boot without requiring a connection to a computer, and without requiring input from the user. A good recent example of this would be Pangu for iOS 9.0.2.
Tethered jailbreaks are the second flavor of jailbreak and are nowadays a lot less likely to stumble across, however a lot of untethered jailbreaks have made use of a tethered exploit in the past to achieve a fully untethered jailbroken state. Tethered refers to the requirement that in order to boot up into a jailbroken state, a computer running the jailbreak's exploit code is required. There's no recent examples of something like this since the redsn0w days of iOS 4-6.
Semi-tethered (or semi-untethered) are the third flavor of jailbreak and arguably the rarest. They allow a device to fully reboot, however it will not boot into a jailbroken state, and will revert to a pre-jailbroken state. In order to get back into a jailbreak, a third party is required, usually in the form of a computer, however as evidenced by Pangu's awesome 9.3.3 jailbreak this isn't always the case, and the jailbreak can be stored on the device in the form of an app that can be run at any time.
So, to summarize;
- Untethered - reboot without computer and your jailbreak still works.
- Tethered - you need a computer to achieve a full reboot.
- Semi-tethered/semi-untethered - you can reboot however only into a non-jailbroken state until further input from a jailbreak source.