1. AC Question's Avatar
    I bought an unlocked ATT HTC One m7 and it has android 4.4.2 loaded onto it. I want to update it to the lollipop update, but it's on MetroPCS so I can't use ATT software update. Tried to use RUU on HTC website but I keep getting ERROR 155:. What do I do? Thanks!
    06-26-2015 09:51 PM
  2. Rukbat's Avatar
    Is the phone rooted? If so, you can't update it. (Updating a rooted phone could brick it. You'd have to flash a stock ROM - back up everything first, because you'll lose it - then update.)
    06-26-2015 11:44 PM

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