In order to know, what’s an untethered jailbreak, we should first know, what’s a jailbreak?
Jailbreak or jailbreaking is a process by which iOS (iPhone, iPad, iPod) users can remove the restrictions or limitations placed by Apple on their devices. Through jailbreak, one can download third party/unauthorized apps and unauthorized modifications/softwares, which Apple does not allow otherwise. It allows the Apple users to download apps from Cydia app store, an app that appears on all jailbroken devices. You can read more about Jailbreaking on this site called iOS Kingdom.
Hence, there are two types of jailbreak-
Under this jailbreaking process, one needs to attach his/her apple device to the computer, every time the device is restarted or rebooted. Whenever you turn your idevice off and back on, you will need a jailbreaking software to get started and hence, would require a connection (tethering) with computer system to restart the device. IPhone 4 and iPhone 4S users need tethered jailbreak! RedSn0w and sn0breeze are some of the popular tethered jailbreak softwares.
Untethered jailbreak, as the name suggests, requires no tethering, therefore no computer system is required to restart the device. You can turn your idevice on and off, without having a need to be connected with a computer. Untethered jailbreak is a one-time activity, which makes your device free of any restrictions imposed by Apple! iPhone 3GS models, iPod touch 4G, Apple TV2G and many other apple devices can have untethered jailbreak! Some of the iOS 8.1 Untethered Jailbreak softwares include –Absinthe 2.0.4 Jailbreak 5.1.1, RedSn0w Untethered,Pwnage Tool 5. 1. 1, etc.,.
Risks and advantages
The advantages of jailbreak include, downloading of various softwares and applications, which cannot be downloaded from the Apple app store. You can download and use unauthorized applications on your idevices, which are not otherwise vetted by the App
By jailbreaking, obviously, one is risking his/her apple device. Once the idevice is jailbroken, Apple is not responsible for any of the restoration of your data or software. The Apple warranty is removed with jailbreaking and the users can download unapproved applications.Many jailbroken device users have complained of the device being lagged or getting frozen, after they jailbreak their idevices.
Therefore, if there are advantages of jailbreaking, then there are also some risks attached to it. With every new Apple device, Apple is making it more difficult for the users to jailbreak because jailbreaking is an illegal and risky process