How To Jailbreak iPhone 4, iPhone 3GS On iOS 4.3.1 Using Redsn0w [Windows / Mac]

News | Sunday April 3 2011 12:56 AM | Comments (0) Tags: , , , ,

iPhone Dev team released
, which allows
(untethered).
In this guide, we will take you through the step by step procedure to jailbreak iPhone 4, iPhone 3GS on iOS 4.3.1 using Redsn0w.
Here are some important points to note before you proceed.
This guide is meant for iPhone 4 and iPhone 3GS users only.
This guide is not meant for iPod Touch and iPad users. iPad 1 users can checkout this
, while iPod Touch users can checkout this
.
If you want to unlock your iPhone then please don’t use this guide as Redsn0w doesn’t preserve baseband.
.
and at your own risk.
Please do not forget to backup your iPhone before you proceed. You can
for instructions on how to backup your iPhone .
After the jailbreaking process is complete, do not forget to checkout our article on
.
Please ensure you are running latest version of iTunes i.e. iTunes 10.2.1/iTunes 10.2 or later.
Download Redsn0w 0.9.6rc9 (
” on your desktop.
You need to download iOS 4.3.1 firmware file:
for iPhone 4 users (iPhone 3,1_4.3.1_8G4_Restore.ipsw)
for iPhone 3GS users (iPhone 2,1_4.3.1_8G4_Restore.ipsw)
Double click the Redsn0w zip file and extract the application to the Redsn0w folder.
Connect your iPhone to the computer, which should automatically launch iTunes.
Skip steps 5 and 6, if your iPhone has already been upgraded to iOS 4.3.1.
‘ section on the left pane of iTunes, select your iPhone device. Now, hold down the Shift button (Option button for Mac users) and click the ‘
‘ button.
Navigate to the Redsn0w folder on the desktop and select the downloaded iOS 4.3.1 firmware file (iPhone 4 users: iPhone 3,1_4.3.1_8G4_Restore.ipsw, iPhone 3GS users: iPhone 2,1_4.3.1_8G4_Restore.ipsw). Click on the ‘
‘ button to let iTunes update your iPhone with the required firmware. You will be asked to setup your iPhone either from a previous backup or setup as a new iPhone , select the backup you want for your device (ideally should be the most recent one). Wait for iTunes to finish.
Navigate back to the Redsn0w folder and launch the Redsn0w application. If you’re a Windows XP or Windows 7 user then try running Redsn0w as 
(right-click on the Redsn0w exe and select ‘Run as an Administrator’).
You will be asked to select the corresponding IPSW file. Click on the Browse button and select the iOS 4.3.1 firmware file (iPhone 4 users: iPhone 3,1_4.3.1_8G4_Restore.ipsw, iPhone 3GS users: iPhone 2,1_4.3.1_8G4_Restore.ipsw).
Redsn0w will verify the firmware file and inform you if it has successfully identified it. Click on ‘
‘ to proceed.
Redsn0w will now start preparing the jailbreak data.
You will now be prompted to select the jailbreak options you would like. Make sure Cydia is selected and select ‘
‘ to continue.
You will now be prompted to switch OFF your iPhone and plug it to the computer. Follow the instructions and click on ‘
You will now need to put your iPhone into the DFU mode. Redsn0w will take you through the necessary steps:
Your iPhone should reboot now.
Redsn0w will now begin uploading the new RAM disk and kernel.
.
You will now be notified once the jailbreaking process is complete. Click on the ‘
‘ button to exit the application.
Your iPhone will reboot once again (which could take approximately 5 minutes). After it has rebooted, your iPhone should be successfully jailbroken. You should find
jailbreak app on your iPhone ’s home screen.
If you’re new to the jailbreaking world and wondering what to do after jailbreaking your iPhone , checkout our 
category page to find out the apps you can install on your iPhone using the Cydia app.
Please don’t forget to let us know how it goes in the comments.

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