Why won't pangu8 work with ios 8.1.2?

I have a iphone 5 with ios 8.1.2 and my applecare recently expired because it has been 2 years since i got it. So i tried to download pangu8 but it says it won't work with ios 8.1.2 any Evasi0n ones that work or how do i get this to work

You can use TaiG to jailbreak 8.1.2.