How to Jailbreak Your iPhone 3GS Using RedSn0w (Windows) [4.3.5]

Posted July 30, 2011 at 6:17am by iClarified | Please help us and submit a translation by clicking here | 185082 views
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These are instructions on how to jailbreak your iPhone 3GS on the 4.3.5 firmware using RedSn0w for Windows. The Mac version of this tutorial is here. If you are on 4.3.3 or lower make sure you do NOT update to iOS 4.3.5. Use the untethered JailbreakMe instead. You can find the appropriate JailbreakMe tutorial here.

Make sure not to update to iOS 4.3.5 if you need an unlock as one is not yet available. Also please note that this jailbreak is tethered for those on the new bootrom.

Step One
Create a folder on your desktop called Pwnage

Download RedSn0w 0.9.8b7b from here and place it in the Pwnage folder. Likewise, download the latest 4.3.5 firmware from below and place it in the same folder.

4.3.5 (3GS): iPhone2,1_4.3.5_8L1_Restore.ipsw

Extract the RedSn0w zip file into the same folder.

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 Shift and click the Restore button. 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 4.3.5 firmware ipsw. Click the Open button to continue.

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.

**Windows 7 users need to run RedSn0w as an administrator in Vista compatibility mode. You can do this by right clicking the executable and selecting Properties from the contextual menu

Step Four
Once RedSn0w opens click the Browse button

Step Five
Select the 4.3.5 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.

You will be prompted to indicate if this is a newer model of the iPhone 3GS. If you're not sure you can determine follow this tutorial to determine which bootrom you have.

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

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

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

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

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 Eleven
Your iPhone will now reboot

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

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.

*As usual a big thanks to the iPhone Dev-Team for their hard work and contribution to the iPhone community.
**Windows 7 users can try running RedSn0w as an administrator in Windows Vista or XP compatibility mode if you experience any difficulties.

Once RedSn0w has finished jailbreaking your device you will need to boot it tethered if you have a newer iPhone. Rerun RedSn0w and this time select Just boot tethered right now from the list of options instead of installing Cydia.

Add Comment
itaymis - April 7, 2013 at 7:28pm
try this one, I have unlocked my phone there. very fast service (about 6 hours total) and cheap, now i can update to any version without having to worry that my phone will be locked ever again. Only 9.99 for phone unlocks!
Dan - February 11, 2012 at 5:44pm
Windows7 64 bit iTunes Red Sn0w 9.10b5 When I try and restore in iTunes using 2,1_4.3.5_8L1 I keep getting errors and cannot make it past the iTunes restore phase. Where's my flaw?
MaEsTrO - September 17, 2011 at 7:34pm
Hi, I just baught a 3GS 32Gb Iphone and it's already unlocked in another country, now i'm using it with a different sim which works great but it's not jailbroken ( no cydia installed ), model number is MC133B and it's also Old boot. I was wondering if i jailbreak my iphone will it be locked again? and how can i check if it is factory unlocked. Note that the IOS is 4.3.5 and BB 05.16.02. that's why i'm worried about jailbreaking it coz if it's locked i will be stuck in this unlockable baseband and i'll have to upgrade to BB 6.15 and loose my GPS which i don't want to. Any help?!
Wilbert odom - August 16, 2011 at 7:14pm
Need help
Dhany WIbiksana - August 15, 2011 at 10:32pm
Unable to recognize current ipsw with 4.3.5 & redsn0w_win_0.9.8b4
Potrod - August 20, 2011 at 2:01am
Select the 4.3.4 firmware ipsw instead. That is a typo in the tutorial. In the screenshot it shows 4.3.4.
11 More Comments
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