How To: Jailbreak iOS 4.2.1 in 5 Minutes [with redsn0w]

So here’s another post of our famous 5 minutes series to help you Jailbreak you iPhone 4, iPhone 3G, iPhone 3GS, iPad or iPod Touch on iOS 4.2.1 in just 5 minutes.

Warnings:
1. If you have a carrier subsidized iPhone, then don’t upgrade to iOS 4.2.1 for now as an unlock is not yet available.
2. This is a tethered jailbreak which means you’d need a computer with redsn0w to boot into the jailbreak state every time you start your device.

5 Minute Guide to Jailbreak iOS 4.2.1:

Let’s start now!

1. Download iOS 4.2.1 for your iPhone, iPad or iPod Touch.
2. Download the latest version of redsn0w from iPhone dev team blog. Look for ‘Mirrors’ heading at the end of this post.
3. Run redsn0w on your computer PC/Mac, ‘Browse’ to select the iOS 4.2.1 file (IPSW) from your hard drive.
4. Now redsn0w will jailbreak the iOS 4.2.1 file for you.
5. Choose one or more options from the next screen. You may only choose ‘Install Cydia’ for now.
6. Connect your iPhone, iPod Touch or iPad with your PC/Mac and then turn it off. You should see this same instruction on your screen. Don’t proceed to the next screen until your device is both turned off and connected to the computer.
7. Proceed to the next step. You have to make your device to enter into DFU (device firmware upgrade)/recovery mode.
8. Press and hold the power button for as long as the redsn0w asks you to do that.

Once the second step is highlighted in the on-screen instructions, press the home button and hold it without releasing the power button. Wait until the step 3 is highlighted on redsn0w window on your computer screen. Now carefully release the power button without releasing the home button. Keep holding the home button unless your device enters the DFU mode.
8. Your device has entered the DFU mode now. If not, don’t worry and try again. Once in DFU, redsn0w will install the jailbreak.
9. Your device is now jailbroken. Enjoy!

If you are on iOS 4.1, you can jailbreak your device in less than 5 minutes. Don’t forget to check out our famous 5 minute guides hub to unlock your iPhone 4, jailbreak it or get root access on your Android phone.

Posted in: iOS-Apple-operating-system-i-os,Unlock or Jailbreak