Download Link File: This video shows how to jailbreak an iPhone or iPod Touch running on 3.1.2 firmware using Blackra1n. Blackra1n works on both Windows and Mac computers. Just make sure you download the correct version for your computer. PREREQUISITES: 1. Plug device into iTunes via USB 2. Upgrade firmware to 3.1.2 3. COMPLETELY RESTORE to original settings To upgrade firmware, click "Check For Update" in iTunes, then click "Download and Install".