Prior to iTunes 10.5, the AMDS architecture was optimized for older iOS iterations and lacked specific optimizations for the "Restore" and "DFU" mode connectivity handshakes introduced in later iOS 5 and iOS 6 iterations.
Warning: Jailbreaking can void warranties, cause instability, and expose your device to security risks. Proceed at your own risk. This guide assumes you understand those risks. p0sixspwn requires itunes 105 or above
p0sixspwn needs a maximum iTunes version of around 11.1.5, not any version higher than 10.5. Prior to iTunes 10
Download the official installer for (ensure you choose the 32-bit or 64-bit version matching your Windows OS). Install the software normally. Prior to iTunes 10.5