iOS 6.1 beta 3 has been released to developers, this tutorial shows how to jailbreak it. This jailbreak is a tethered jailbreak, and works with pre-A5 devices like the iPhone 4, iPhone 3GS, or iPod touch 4th gen. It also should be reiterated that the jailbreak is for developers only.
Step 1: Download iOS 6.1 beta 3 (you must be a developers to do so), and download RedSn0w 0.9.15b3. You’ll also need access to the iOS 6.0 firmware for the device that you’re using. You can download the iOS 6.0 firmware, which is public, from our downloads page.
Step 2: Connect your device to your computer and Open RedSn0w 0.9.15b3. Click Extras > Select IPSW > and point to the iOS 6.0 firmware for your device. It should identify the firmware successfully.
Step 3: Go back to the main RedSn0w page and click Jailbreak. Once it process the jailbreak, ensure Install Cydia is checked and click Next.
Step 4: Place your device into DFU mode, and the jailbreak should proceed until completion.
Step 5: Click Back on the RedSn0w window, and click Select IPSW again. Again, point to the iOS 6.0 firmware, and click Just boot.
Step 6: Place your device back into DFU mode, and a tethered boot will proceed. You should notice a pineapple logo as the device boots.
Step 7: Once at the Lock screen, unlock the device, and swipe to the second page. You should see the Cydia app icon present on the second page.
Jailbreaking iOS 6.1 beta 3, like previous betas, is extremely simple and straightforward. The key is pointing to the iOS 6.0 public firmware.