Jailbreak - iOS 5 - Semi untethered. As most of you know that the Dev team and Chronic Dev-team are working hard to port iOS 5 untethered jailbreak to iPhone 4, 3GS, iPod Touch 4G, 3G. The BigBoss has announced about iOS 5 semiuntethered jailbreak or to be accurate (semi tethered jailbreak), whatever it called, let's show you what does semi tethered jailbreak means after the jump.

What's tethered jailbreak :

Tethered jailbreaks are frustrating because they require a computer connection to boot a jailbroken iOS device. The concept of a tethered jailbreak has been around a long time, but essentially it means this: every time your iPhone or iPod touch reboots or the battery dies, you have to connect (tether) your iOS device back to your computer so that the hardware can boot with the aid of the jailbreak application.

What's untethered jailbreak :

An untethered jailbreak is the preferred jailbreak because it requires no connection to your computer except for the initial jailbreaking process. You can reboot your iPhone or iPod touch as much as you want without having to tether it to your computer to boot. If the battery dies on a device that has an untethered jailbreak, it’s no big deal you just charge it again and it will boot as usual.

What's Semi-Tethered jailbreak means :

The main issue of tethered jailbreak is that you need to connect your device to computer to use Redsn0w "Just Boot" tethered option every time your reboot your device. Semi-tethered jailbreak come specially to fix this issue, as it allows you reboot your device without connecting it with computer. So now you have untethered jailbreak on iOS 5. But the main issue is that 99% of jailbreak apps and tweaks won't work at all. So what now ? Semi-tethered jailbreak is only a protection for you if your device reboots while you were away from your computer, but you will be able to use the most important functions of you iPhone until you get home and connect it with Redsn0w.

Semi-tethered jailbreak iOS 5 Supported Devices :

iPhone 4
iPhone 3GS
iPhone 3GS New Bootrom
iPad 1
iPod Touch 4G
iPod Touch 3G

Semi-tethered jailbreak iOS 5 Un-Supported Devices:

iPad 2
iPhone 4S

While using Semi- Tethered jailbreak - Working Functions :

Can use phone, sms (text messages)
Can use every other stock app on iPhone.
Can use other appstore web browsers such as atomic web browser

While using Semi- Tethered jailbreak - Not-Working Functions :

Cannot use mobile safari
Cannot use mail app. You could install a gmail app from appstore or such instead.
You cannot use any jailbreak tweak, app, cydia until you boot tethered.
While in the semitether booted state, you should not add a jailbreak ios5 notification such as sbsettings to notifications during this state or your device will be stuck in a respring loop until you get home to “boot tethered”.
How to Semi-Untethered jailbreak iOS 5:

Step 1: You must install iOS 5 on you device and tethered jailbreak it (Jailbreak guide - Click Here)

Step 2: Now, open Cydia > Manage > Sources.

step 3: Tap on Edit > Add and insert the following repository http://thebigboss.org/semitether
Step 4: Search for SemiTether and install it then reboot your device.