You should remember that this is still a tethered jailbreak and it will not install Cydia on your device. You must be aware that currently, iOS 6 is available only to developers. Thus, you must be a developer to access iOS 6 beta 3.
We will demonstrate the procedure of using RedSn0w 0.9.13dev3 to jailbreak an iPhone 4 running iOS 6 Beta 3. This procedure has been tried and tested. However, if due to some unknown reason, if you fail to achieve the desired results, then The Apple Bites would not be responsible for the outcome. You are doing this at your own risk.
First we will show you a video to explain how you should do it:
Now here is the procedure explained step-by-step:
STEP 1 – First of all, you should download RedSn0w 0.9.13dev3 and run it .
STEP 2 – Place your device into Device Firmware Upgrade (DFU) mode.
STEP 3 – In RedSn0w click Extras > Select IPSW and point to your iOS 6 beta 3 firmware. Now RedSn0w should display a message stating that the firmware was successfully identified.
STEP 4 – Go back to the main page of RedSn0w. Click jailbreak. Once preliminary configuration is complete, ensure Install SSH is selected, and continue. The jailbreak process should finish to completion.
STEP 5 – Once you return to the Home screen on your device, place the device back into DFU mode. Then, perform STEP 3 again.
STEP 6 – Click Just boot under the Extras menu subset. RedSn0w will perform a tethered boot on your device.
Now your iPhone 4 has been successfully jailbroken.
Did this procedure work for you? Post your comments.
Source: iDownload Blog