Apple released iOS 8.4.1 on August 13, 2015. Even though this is a very minor update, Apple patched TaiG's jailbreak utility. This firmware simply fixes several small issues relating to Apple Music and Beats 1 Radio. We recommend that all users that are currently jailbroken and wish to stay that way to avoid the new firmware at all costs. In this unfortunate patch Apple did not address all vulnerabilities meaning that some select unattended vulnerabilities may be reused in a new utility.
It is highly possible that TaiG has additional vulnerabilities stored that can't be used for iOS 9 because of it's "Rootless security". This does mean that we may see another jailbreka utility for iOS 8.4.1. Stay tuned, we will post when a new jailbreak utility is out.
All information here is from Evasi0n Jailbreak's post and Apple.com
It is highly possible that TaiG has additional vulnerabilities stored that can't be used for iOS 9 because of it's "Rootless security". This does mean that we may see another jailbreka utility for iOS 8.4.1. Stay tuned, we will post when a new jailbreak utility is out.
All information here is from Evasi0n Jailbreak's post and Apple.com