Jailbreak iOS 4

Below is a list of guides to Jailbreak iOS4.0 depending on your device, please select the appropriate guide and follow the steps. Note for most the guides you will need to have 3.1.2 shsh blobs saved to do the jailbreak.

Jailbreak iPod Touch 1G, 2G, 3G and iPhone 2G, 3G, and 3GS(old bootrom & non MC) using Sn0wBreeze


Description

Sn0wbreeze 1.7 for 4.0 has been released. Just like PwnageTool4.0 / 4.01 for Macs , you can now create custom pwned / jailbroken ipsw files on Windows too which can now jailbreak all iOS devices (except ) on iOS 4, including iPhone 3GS (newbootrom), iPod touch 2G (MC models) and iPod touch 3G. But there is a catch to it! You will need to have their SHSH blobs saved for iOS 3.1.2 in order to successfully jailbreak these devices oniOS 4. Also the jailbreak for iPhone 3GS (new bootrom), iPod touch 2G (MC models) and iPod touch 3G on iOS 4 will be tethered, which means whenever you turn off your phone, you will need to re-connect it to a computer to be able to turn it back on.


1) Make sure you have the latest version of iTunes, if you don't update it now.

2) Sstart iTunes and sync your iPod with your PC so that it backs-up all your important data including settings, apps, music, contacts and photos.

3) Download Sn0wbreeze from here and the original iOS 4 firmware file (which can be found here) for your version of iPod touch ). Create a new folder called "Jailbreak" and move all these files to the Jailbreak folder.

4): Start Sn0wbreeze and select “Simple Mode”.

5) Sn0wbreeze will now ask you to browse for your .ipsw file. Select the correct iOS 4 firmware .ipsw file by clicking the “Browse” button. Sn0wbreeze will verify the selected file and then will present you with following screen.

6) Sn0wbreeze will now create the custom .ipsw file for your iPhone which will be jailbroken.

7) Now you will have to restore your iPod to this custom firmware 4.0 that you just made using Sn0wbreeze for your iPod. Click on your iPod from the sidebar in iTunes and then press and hold left “Shift” button on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.

This will make iTunes prompt you to select the location for your custom firmware 4.0. Select that custom .ipsw file and click on “Open”.

8)Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything other than leave the iPod. Just wait while iTunes installs the new iOS 4 on your iPod. Your iPod screen at this point will be showing a progress bar indicating installation progress. After the installation is done, iPhone will restart automatically and you should now have a fully jailbroken iPhone running on iOS 4.

Source:http://www.redmondpie.com/jailbreak-ios-4.0-ipod-touch-3g-2g-mc-model-sn0wbreeze/

How to Jailbreak Your iPod Touch 2G Using RedSn0w

Instructions on how to jailbreak your iPod Touch 2G (non MC) on iOS 4.0 firmware using RedSn0w for Windows

1) Create a folder on your desktop called Jailbreak. Then download RedSn0w from here and place it in the Jailbreak folder. Also, download the latest 4.0 firmware from below and place it in the same folder.

iOS 4.0 (2G): iPod2,1_4.0_8A293_Restore.ipsw

Then extract the redsn0w app from the RedSn0w zip file by double clicking it.

2) Connect your iPod to the computer and launch iTunes. Select your iPod from the list of devices on the left. Now hold down Shift and click the Restore button. Navigate to the Jailbreak folder on your desktop and select the firmware ipsw. Click the Choose button to continue.

3) Once iTunes has finished updating your iPhone to the desired firmware open the Jailbreak folder on your desktop and launch the redsn0w application from the redsn0w folder.

4)Once RedSn0w opens click the Browse button.

5) Select the firmware ipsw we placed in the jailbreak folder on our desktop then click Open. When asked if you have an iPod touch with a serial number that begins with MC. Click the appropriate button.

6) Once the firmware has been verified click the Next button to continue.

7) RedSn0w will now prepare the jailbreak data.

8) From this window you can select the jailbreak options you would like. Verbose boot displays detailed information on boot of your device and is generally only needed by developers and advanced users. Make sure Cydia is selected. Notice that RedSn0w has already selected to Enable multitasking, Enable homescreen wallpaper, and Enable battery percentage. If you do not need multitasking we would recommend deselecting it as it could make your iPod 2G run very slow.

Once you have picked all your settings click the Next button to continue.

9) Plug your iPod into the computer and make sure its OFF then click the Next button

10) RedSn0w will now guide you through the steps to get into DFU mode.

Hold down both the Home button and the Power button for 10 seconds.
Release the Power button and continue holding the Home button until RedSn0w detects the device.

11) Your iPod will now reboot

12) RedSn0w will then begin uploading the new RAM Disk and Kernel.

13) Once this is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPod finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.