How To: Jailbreak iOS 5 On iPhone 4, iPhone 3GS With RedSn0w 0.9.9b6 [Windows]

Earlier today we told you that the Dev-Team have updated RedSn0w to version 0.9.9b6. RedSn0w was updated to version 0.9.9b6 to fix various bugs when jailbreaking iOS 5. While a majority of these bugs were mostly specific to users jailbreaking their iPhone 3GS (running the 06.15.00 baseband), the Dev-Team notes RedSn0w 0.9.9b6 provides both functional and cosmetic fixes for jailbreaking the iOS 5 firmware.
Note #1: We recommend jailbreaking iOS 5 with RedSn0w 0.9.9b6 even if you are already jailbroken on iOS 5. If you are going to re-jailbreak your iPhone 4 or iPhone 3GS with RedSn0w 0.9.9b6, just ensure you uncheck the install Cydia option.
Note #2: RedSn0w 0.9.9b6 does not allow you to create custom IPSW files for preserving your baseband. This feature is coming soon.
Note #3: RedSn0w 0.9.9b6 is a tethered jailbreak and does not support jailbreaking the iPhone 4S.
Note# 4: If you would like to update to iOS 5 please click here to follow our detailed guide.

Jailbreak iOS 5 On iPhone With RedSn0w 0.9.9b6

Step 1) Download RedSn0w 0.9.9b6 for Windows from the iJailbreak Downloads Section or using the download mirror below:
Mirror #1: RedSn0w 0.9.9b6 (Windows)
Step 2) Once you have downloaded RedSn0w to your desktop you will need to launch it by clicking the executable file.

Step 3) With RedSn0w up and running you will then click the Jailbreak button.

Step 4) You will come to a screen where you will need to put your iPhone into DFU mode. Read through and follow the instructions presented to you which is to plug in and power off your iPhone and click the Next button.

Step 5) When you click the Next button you will need to follow the instructions presented to you to put your iPhone into DFU mode.

• Hold down Power (corner) button for 5 seconds.
• Without releasing the Power button, also hold down the Home (bottom center) button along with the Power button for 10 seconds.
• Without releasing the home button, stop holding down the power button for up to 15 seconds.

Step 6) After you successfully enter DFU mode RedSn0w will now prepare the jailbreak data. Once RedSn0w is done ensure the “Install Cydia” option is checked and click the Next button.
Step 7) RedSn0w will begin jailbreaking your iPhone. DO NOT interrupt or use your Mac during this time. When your iPhone is finished being jailbroken it will reboot into a jailbroken state.
Optional: Booting Tethered - When you Jailbreak your iPhone on iOS 5 (official version) you will have a tethered Jailbreak. Meaning in order for your iPhone to turn back on you will need to boot it using RedSn0w (this applies every time your iPhone looses power). To do this launch RedSn0w again and click the Extras Button > then click the Just boot button and you will need to put your iPhone into DFU mode again.
You can also follow our how to guide to booting a tethered jailbreak using RedSn0w on Windows by clicking here.
Note: Yes, you need to do this every time your iPhone looses power.

Congrats! You should now have a jailbroken iPhone 4, 3GS on iOS 5 using RedSn0w 0.9.9b6 (for Windows).