For the Mac users who are using RedSn0w, there are some instructions going on how to jailbreak your iPhone4 on the 5.0b4 firmware. However the iOS5 isn’t released so these are instruction for the developers only. This process will reason for you to upgrade your baseband potentially ruining your possibilities to unlock; it’ll not hacktivate so you have to your UDID registered among a developer, and it is tethered. If you would like to jailbreak a lesser firmware version you can locate the suitable tutorial just here.

Step #1

First of all you have to make a folder on desktop named Pwnage. Later on download RedSn0w in this folder, similarly, download the newest 5.0b4 firmware from the iOS developer center same in the folder as well. After this you just have to extract the zip file of RedSn0w by the double click.

Step #2

In this step you connect with your computer and launch iTones.

Decide on your iPhone from the listing of devices on the left. Now hold down selection and click the Restore button. Restore is favored as it won’t create several wasted space on your iPhone.

Step #3

One time iTunes has over updating your iPhone to the preferred firmware open the Pwnage folder on your desktop and start on the redsn0w application which we exact.

Step #4

Formerly RedSn0w opens you have to click the Browse button.

Step #5

After this select the 5.0b4 firmware ipsw we to be found in the Pwnage folder on our desktop open it.

Step #6

Just the once the firmware has been confirmation later than this click the next button to carry on.

Step #7

RedSn0w will now get ready the jailbreak data.

Step #8

Now from this window you be able to pick the jailbreak options you would like. Make definite Cydia is selected, and click the Next button to continue.

Step #9

After this plug your iPhone into the computer and make clear in your mind it’s OFF then click the Next button.

Step #10

Now RedSn0w will direct you during the steps to obtain into DFU mode.

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until RedSn0w detects the device.

Step #11

Now your iPhone will reboot.

Step #12

RedSn0w will then start on uploading the latest RAM Disk and Kernel.

Step #13

One time this is complete you will be informed that RedSn0w is done. Click the Finish button, When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.

in the end Just the once you have jailbroken you will have to to rerun redsn0w and choose Just Boot Tethered right now in its place of installing Cydia.

Credited – iclarified for images and all helping steps.