How to Jailbreak Your iPhone 3GS, iPhone 4 Using Limera1n (Mac)
These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Limera1n for Mac. Limera1n supports iOS 4.0, 4.0.1, 4.0.2, and 4.1. You can find the Windows version of this tutorialhere. Remember: Do not update to iOS 4.1 if you need the unlock. Ultrasn0w does not support that baseband yet. The only exception is the iPhone 4. You can update to iOS 4.1 without upgrading your baseband by followingthistutorial.
Step One Open your web browser of choice and navigate tohttp://www.limera1n.com.Click theMac logo at the bottom of the screen.
Step Two When prompted save the download to your desktop
Step Three Double click thelimera1n.zipfile from the desktop to extract the application, then double click it to launch.
Step Four Click the largemake it ra1nbutton
Step Five You iPhone will now be placed in recovery mode.
Press both the power and the home buttons.
When Limera1n asks you to, release the power button.
Your phone will now be in DFU mode
As limera1n performs its exploit you will see the image of a lime raindrop on your iPhone.
Limera1n will let you know when it is complete.
Step Six After you power back on your iPhone you will see a new icon on the SpringBoard entitledlimera1n. Press it to continue.
Step Seven Once Limera1n opens selectCydiathen press theInstallbutton at the top right of the screen.
Step Eight Once theCydiainstallation has completed you must reboot your iPhone.
Step Nine When your iPhone has restarted you can run Cydia. Let it do all the necessary updates then follow ourUnlocktutorialif possible for your device.
NOTE*: To remove thelimera1nicon from your desktop you can relaunch the app and tap theUninstall Limera1nbutton or install CyDelete from Cydia then use it to delete the application.
***A big thanks goes to Geohot who made this jailbreak possible.