mobile

So, my HTC One M8 is still on CM11, with S-On and rooted with TWRP installed. I have tried to update CM and it fails every time. I tried to revert back to stock by using HTC's RUU, but it fails every time and when it does I lose cell service and WiFi capability. I have Factory reset, which has restored my Cell service and WiFi, but I am still runing CM11. I have watched countless videos and tried to follow guides on how to revert but I simply cannot find one that's up to date, and on XDA I can't find the one pertanent to my CID Num, CWS__001. I am desperate and I really would just like to be on stock Rom again, is there anything that I can do? Does anyone have an idea of what can be done to revert?