WARNING I downloaded update on T-Mobile and it almost bricked my m8. after the update it went black screen for 10 minutes I could do nothing then it turned on and I had a bunch of warnings this didn't work that didn't work and I had to keep clicking don't send like five thousand times and then I rebooted somehow I managed to reboot between all those warnings . I had to update all apps also. Just be very careful and the people saying it causes battery drain is true. I had a hundred percent battery at first update I am down to 50 percent after 40 minutes of use. Had I had another choice I'd wait longer