SHAFAQNA – HTC hasn’t always had success upgrading One users to the latest version of Android within its promised 90-day window, and history is unfortunately repeating itself with Android 5.0 Lollipop on the way. The phone maker is now warning that “some carrier versions” of the One M8 and M7 won’t get Lollipop by the expected February 1st deadline. Reportedly, Google’s rush to fix Lollipop (which emerged, shall we say, less than polished) gave HTC little time to both finish its own update and put it through the usual provider testing routine.
You might not see the update all that soon, either. In the US, it still hasn’t reached the certification stage with the big four carriers (AT&T, Sprint, T-Mobile and Verizon). At least some UK users report seeing the new software, but there’s no handy chart to detail progress. As you might guess, the only surefire way to get Lollipop right now is to own a One M8 developer edition, Google Play Edition or unlocked model — otherwise, you might have to make-do with last year’s software for a while longer.
Source : http://www.engadget.com/2015/01/31/htc-lollipop-update-snags/