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How to Jailbreak iPhone 4 in iOS 5 Using RedSn0w 0.9.8b1 [Mac]

These are instructions on how to jailbreak your iPhone 4 on the 5.0b1 firmware using RedSn0w for Mac. Since iOS 5.0 has not yet been released these are instructions for developers only. This procedure will cause you to upgrade your baseband potentially ruining your chances for an Unlock, it will not hacktivate so you must have your UDID registered with a developer, and it is tethered.
If you want to jailbreak a lower firmware version you can find the appropriate tutorial here.
Step One
Create a folder on your desktop called Pwnage
Download RedSn0w from here and place it in the Pwnage folder. Likewise, download the latest 5.0b1 firmware from the iOS developer center and place it in the same folder.
5.0b1: iPhone3,1_5.0_9A5220p_Restore.ipsw
Extract the RedSn0w zip file by double clicking it.

jailbreak_iPhone_4_redsn0w

Step Two
Connect your iPhone to the computer and launch iTunes.

Select your iPhone from the list of devices on the left. Now hold down Option and click the Restorebutton. Restore is preferred as it won’t create any wasted space on your iPhone.

Navigate to the Pwnage folder on your desktop and select the 5.0b1 firmware ipsw. Click theChoose button to continue.

5.0_firmware

Step Three
Once iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.

Step Four
Once RedSn0w opens click the Browse button

redsn0w_0.9.8b1

Step Five
Select the 5.0b1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.

browse_ipsw

Step Six
Once the firmware has been verified click the Next button to continue.

ipsw_identified

Step Seven
RedSn0w will now prepare the jailbreak data

Step Eight
From this window you can select the jailbreak options you would like.
Make sure Cydia is selected and click the Next button to continue

Redsn0w_install_cydia

Step Nine
Please plug your iPhone into the computer and make sure its OFF then click the Next button

redsn0w_jailbreak_ios5_iphone_4

Step Ten
RedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here.

redsn0w_DFU

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

redsn0w_DFU_2

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

redsn0w_DFU_3

Step Eleven
Your iPhone will now reboot

redsn0w_0.9.8b1_jailbreaking

Step Twelve
RedSn0w will then begin uploading the new RAM Disk and Kernel.

redsn0w_0.9.8b1_jailbreaking_2

Step Thirteen
Once this is complete you will be notified 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.

redsn0w_0.9.8b1_jailbreak_iOS_5_iPhone_4_done

*As usual a big thanks to the iPhone Dev-Team and Geohot for their hard work and contribution to the iPhone community.

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