The 10.3.4 update, released by Apple, addressed a critical vulnerability that was being used by the TaiGone jailbreak tool to gain root access. The patch, which was part of Apple's ongoing efforts to secure its operating system, effectively closed the hole that TaiGone was using to jailbreak devices. As a result, users who updated their devices to 10.3.4 were no longer vulnerable to the TaiGone jailbreak.