you can read on this post about guide jailbreak ios 6.1 Beta As we all know Apple has, surprisingly released iOS 6.1 beta 2 for developers, that introduces very little news, the Dev Team makes us aware that tool 0.9.15 b3 Redsn0w is able to Jailbreak iOS 6.1 Beta 2 on devices with A4 Processor. The Jailbreak will be tethered. read about what is jailbreak definition

Guide: Jailbreak iOS 6.1 Beta 2 with 0.9.15 b3 Redsn0w (Mac, Windows)

Compatible Devices for jailbreak ios 6.1

• iPhone 4 CDMA and GSM
• iPod Touch 4 g

Requirements

• iOS Beta 6.1 theRemote device (if you're in Beta 1 just do the update via OTA
• Download iOS 6.1 Beta 2: Download jailbreak for iphozne 4, download jailbreak for ipod touch 4
• Download iOS official 6.0: paste this url http://adf.ly/GRemp
• Download with Redsn0w 0.9.15 b3 at the bottom of our page: "Redsn0w All Versions DL" paste this url http://adf.ly/GReql

Guide to jailbreak ios 6.1

1. install iOS 6 beta 2 on your device A4.

2. Start Redsn0w 0.9.15 b3 and connect your device to your pc or Mac.

3. Go to Extras > Select IPSW file and select the .ipsw for iOS 6.0 previously downloaded.

4. return to the main screen of RedSn0w and click Jailbreak.Be sure to select only the voice Install Cydia and then click Next.

5. follow the instructions to put your device in DFU.

-To put the device in DFU mode:

To active device:

Press the Power button and the Home button for 10 seconds.
Release the Power button but continue to hold Home for another 10-15 seconds.
The device's screen will be black and you will hear the sound when you connect a device to your pc.
iTunes will detect a device in recovery mode.
You are in DFU MODE
7. wait for the completion of the Kernel patch.

8. once the device is restarted, it therefore replace it in DFU mode as described above.

9. restart Redsn0w and select as in point 3 the iOS file 6.0

10. After that click on Extras and then Just Boot to perform the first reboot tethered Jailbroken device.

11. check that you have the icon on the home screen of Cydia, if so you will have successfully carried out the Jailbreak of iOS 6.1 Beta 2.

Here is a Video that may help in the operation:

Video How to jailbreak iOS beta 6.1 – tethered pre-A5