For those of you who want to install GPE(Google Play Edition) ROMs on your HTC One, you will have to upgrade your radio. To upgrade the radio, you must have S-OFF. (Or you probably could unroot with GPE stock ROM and do OTA also.) So, here’s how to do it. First, we will be using RumRunner S-Off, which works on many different devices like HTC One X/XL, HTC One Max, HTC One Mini, HTC One S, HTC Evo 4G LTE, HTC First, HTC Butterfly, and HTC Butterfly S. RumRummer works on all AT&T, T-Mobile, Sprint, Verizon, International, and Unlocked phones.