A few weeks following the 3rd release of the beta version of iOS 6.1, Apple has brought out beta 4 for developers who are registered with Apple. If you happen to have got it on your iPhone and fancy jailbreaking, you can try the tethered iOS 6.1 jailbreak from Redsn0w 0.9.15b3.
Redsn0w iPhone iOS 6.1 jailbreak
The fourth beta of iOS 6.1 is build 10B5126b and developers can get it as a delta update or download it on the developer portal at Apple. The update is for devices such as the Apple iPhone, iPod and the iPod Touch. If you already have the beta version, the new one can be found in General> Software Update, over in your settings.
The delta download is 56.5MB; however the full update is as large as 896MB. Apple has also said that the beta 3 version of their TV software is out, along with the developer preview of Xcode 4.6.
The beta 4 of iOS 6.1 can be jailbroken, just like the all the previous versions, with Redsn0w 0.9.15b3. However bear in mind that this is the tethered jailbreak and it works only with devices that are powered by the A5 processor. These include the Apple iPhone 4, the iPod Touch 4G and the Apple iPhone 4GS. All of these have the exploit known as Limera1n in them. The jailbreak will not work on devices that are newer. The guide for the jailbreak is aimed at developers and if you want to follow it, here it is.
Install beta 4 onto your device and have iOS 6 on your computer. Then you should download Redsn0w 0.9.15b3.
Connect your PC and device and make sure it is in DFU mode. You can then open Redsn0w 0.9.15b3 and the computer should recognise your device.
Head into Extras and choose IPSW, then go to the firmware file of iOS 6
Redsn0w 0.9.15b3 should identify the firmware and you can then go to the main page and pick Jailbreak.
When the whole process is complete Cydia should have a tick mark against it. Choose Next and the process of jailbreaking will start.
When this is complete the device goes to the lock screen. put the device back into DFU mode. Head to the main page of Redsn0w 0.9.15b3, choose Extras, then choose IPSW and iOS 6.0 firmware.
Redsn0w 0.9.15b3 should recognise this firmware and then choose Boot tethered and the process should start. You will know when you have been successful when the device boots up and you see a pineapple logo on the display
When the tethered boot is complete the device will be on the lock screen, so unlock it and go to the second home screen. Here you should see the Cydia app. Open this and then wait for it to go through its initial configuration and setup.