Follow the steps below to jailbreak all iPhone’s and iPod touches on OS 3.1.2:
Note for iPhone 3G and 3GS: Do NOT upgrade to iPhone 3.1.2 with blackra1n if you want to keep your unlock as doing so will result in upgrade of your baseband which will make it almost impossible for you to unlock.
如果是有锁版本的,请你先不要升级到3.1.2的固件。
Step 1: Download and install the latest version of iTunes (download link given below).
下载iTune,最新版的,到苹果网站下。
Step 2: You will now need to first update/restore to the original iPhone OS firmware 3.1.2 on your iPhone by using the latest version of iTunes. Download link for iPhone Firmware 3.1.2 is given at the end of the post.
Step 4: Start blackra1n app. If you are on Windows 7 or Vista, run the app with “Windows XP Compatibility” mode by enabling it from the “Properties” tab to avoid any errors during the jailbreak process.