The instructions to jailbreak iPod touch 4G on iOS 4.3.1 is similar to the instructions to jailbreak iPhone 4 or iPad on iOS 4.3.1. You can follow the steps posted here to jailbreak your iPod touch 4G on iOS 4.3.1 along with some changes as posted below.
- On STEP 1, you have to download iPod4,1_4.3.1_8G4.bundle file and then move it to your desktop.
On STEP 6, When PwnageTool prompts to choose your iOS Device, simply select “iPod touch 3G, 4G” option.
- On STEP 7, you have to browse for iOS 4.3.1 for iPod touch 4G
- On STEP 14, you have to use kernelcache.release.n81 and iBSS.n81ap.RELEASE.dfu in place of kernelcache.release.n90 and iBSS.n90ap.RELEASE.dfu.
- On STEP 15, you have to use the following commands in Terminal:
You can download iOS 4.3.1 for iPod touch 4G from here. You can download iOS 4.3.1 PwnageTool Bundle (with Universal Ramdisk Fixer) for iPod touch 4G here. You can download PwnageTool 4.2 from here. You can download iTunes 10.2.1 from here. [Via]