Geohot has released Limera1n jailbreak tool for iPhone 4 and iPhone 3GS running over iOS 4.0, 4.0.1, 4.0.2 and 4.1. Limera1n is available for Windows and Mac OS X.

Here you can find step by step guide to jailbreak iPhone 4, iPhone 3GS with Limera1n on iOS 4.1 whereas the same instructions work to jailbreak iOS 4.0, 4.0.1, and 4.0.2.

Warning: Limera1n is only jailbreak tool not an unlock, so if you want to unlock your iPhone with ultrasn0w then you should not upgrade your device to iOS 4.1 because the baseband will also be upgraded and right now there is no unlock tool available for that baseband version.

Jailbreak iOS 4.1 on iPhone 4 or iPhone 3GS

Step 1

Download limera1n for Windows or limera1n for Mac and save on desktop. Unzip to extract EXE file

Step 2

Connect your iPhone to your system with USB and launch limera1n.exe which was just downloaded

Step 3

To start jailbreak process click make it ra1n button which will display on screen

Step 4

Limera1n will detect your attached iPhone and start entering your device to recovery mode

Step 5

Now, follow the on screen instructions which will put your iPhone into DFU mode

First, hold home + power buttons and keep holding until screen changes the message

Then release Power button by holding the Home button. Your device will prepare to enter into DFU mode

Step 6

When iPhone enter into DFU mode successfully, limera1n will start jailbreak process which takes less than 30 seconds to complete and done message will display on your system’s screen

Step 7

Now, simply disconnect your iPhone from system and Power ON it. You will find limera1n icon on your device, tap on it and select Cydia and tap Install

Step 8

When Cydia will complete installation on your iPhone it means all is done

Note: In case if you could noy find Cydia icon on your iPhone after doing step 8, just reboot your iPhone.

Enjoy! You successfully complete jailbreak iPhone 4, iPhone 3GS on iOS 4.1 with limera1n.

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