After the release of JailbreakMe 2.0, a new jailbreaking tool for iOS 4.0/iOS 4.0.1, now iPhone 3GS (new bootrom) jailbreaking is possible with one click. There is no need to follow all those tedious steps for iPhone 3GS jailbreak on iOS 4.0, simply connect your iPhone 3GS with a reliable internet connection and start jailbreaking. If you have got iPhone 4, head over to this post for the step by step guide to jailbreak iPhone 4 with JailbreakMe.
Step 1: Download the latest iTunes 9.2.1 and backup your images, apps, vidoes contacta, calendars etc.
Step 2: Now update your iphone 3GS to latest iOS 4.0.1. This step is not necessary. You can also jailbreak iOS 4.0 on iPhone 3GS. Learn here how to update your iPhone 3GS (new bootrom) to iOS 4 in 5 easy steps.
Step 3: Using a reliabale internet connnection like WiFi or 3G, point your browser to this address http://jailbreakme.com
Step 4: “Slide to Jailbreak” to start the jailbreaking process.
Step 5: Wait till the required files are downloaded.
Step 6: When the files are downloaded, the jailbreak process will start. Don’t interrupt the iPhone at this point.
Step 7: Once the jailbreak process is completed, you will see the message “Cydia has been added to the Home Screen”.
Step 8: Close the browser and look for Cydia in the springboard. Enjoy your jailbroken iPhone 3GS New Bootrom on iOS 4.0/iOS 4.0.1.
The iPhone Dev Team just tweeted that Unlock for iPhone 3GS is coming in next 48 hours.