The instructions to jailbreak iPad on iOS 4.3.1 is similar to the instructions to jailbreak iPhone 4 on iOS 4.3.1. You can follow the steps posted here to jailbreak your iPad on iOS 4.3.1 along with some changes as posted below.
- On STEP 1, you have to download iPad1,1_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 “iPad”.
- On STEP 7, you have to browse for iOS 4.3.1 for iPad
- On STEP 14, you have to use kernelcache.release.k48 and iBSS.k48ap.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 iPad 1G from here. You can download iOS 4.3.1 PwnageTool Bundle (with Universal Ramdisk Fixer) for iPad 1G from here. You can download PwnageTool 4.2 from here. You can download iTunes 10.2.1 from here. [Via]