HOW TO: Jailbreak iOS 4.2.1 on iPhone, iPod & iPad using redsn0w 0.9.6b4

by Mahesh Kukreja · 5 comments

in Apple

The Dev-team recently updated redsn0w to jailbreak iOS 4.2.1 final!

This is a how-to post to jailbreak iOS 4.2.1 on iPhone, iPod & iPad.

redsn0w is currently untethered for the following devices:

  • iPhone 3GS (old bootrom)
  • iPhone 3
  • iPod touch 2G (Non-MC Model)

And tethered devices are:

  • iPhone 3GS (new bootrom)
  • iPhone 4
  • iPad
  • iPod touch 2G (MC Model)
  • iPod touch 3G
  • iPod touch 4G

Note: If you want to unlock, just stay where you are. Don’t update to iOS 4.2.1

Step 1: Download redsn0w 0.9.6b4. Download links are in this post.

Step 2: You need to update your iDevice to 4.2.1 via iTunes 10.1. Download links are in here.

Step 3: Launch redsn0w 0.9.6b4 and Browse for iOS 4.2.1 IPSW file.

redsn0w 0.9.6b4 - browse

Step 4: After your firmware has been successfully processed and identified, you’ll see the following screen. Select the options you want and click Next.

redsn0w 0.9.6b4 - install cydia

Step 5: Your firmware will be patched. It may take a few moments. After that, turn off your device and plug it into your computer. Click Next.

redsn0w 0.9.6b4 - turn off device

Step 6: You’ll be shown instructions to enter DFU mode. After your device is in DFU mode, the firmware will be patched and your device will be jailbroken.

If you are one of untethered devices (as mentioned at the beginning of the post), you’re done here. Your device is jailbroken.

But, if you are on a tethered device, you need to follow step 7 every time you boot up your iDevice.

Step 7: You must run your device in the so called “jailbroken state” on every reboot by using “Just boot tethered right now” option. This is needed if you want to SSH your device or run Cydia!

If you have any questions, feel free to ask in Comments!

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{ 5 comments… read them below or add one }

Jordan November 27, 2010 at 8:54 pm

Hey man

Thanks so much for this info, I’m somewhat scared thought If I do this to my iphone3gs it will brick it or whatever. Please see my short video explaining my situation :

Basically after updating to 4.2.1 I’m stuck on the Emergency Call screen and I can’t get past it. When I put my Koodo Mobile SIM card in my iphone itunes says it doesn’t recognize it. Reason is because my iphone is only locked to the Bell network. So how would I go about doing this ?




Admin November 27, 2010 at 9:57 pm

I contacted dev team on twitter to inquire whether redsn0w hacktivates iPhone, but still no reply. You can try the redsn0w jailbreak, it won’t brick your phone. Don’t worry! If I get any reply from the dev team, I’ll notify you..


Admin November 28, 2010 at 7:05 pm

redsn0w will hacktivate your iPhone.. Go ahead n try it..


Jordan November 29, 2010 at 2:26 am

thanks man


Arielle April 29, 2011 at 2:41 am

So i just did all this and now my cell is froze and it isnt doing anything but black screen with a lot of white writign but it isnt moving anymore PLEASE HELP


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