I had no problems rooting and getting s-off on my M8 months ago when the exploit was released. I used the weaksauce/firewater method. Now when I try to do the same thing to my gf's M8 it won't work. It's running stock 4.4.2. any ideas? I run weaksauce -> download/run supersu -> try to update the binaries but it keeps saying installation failed. need help! thanks