HTC one M7 won't install newest update.

[AC Question]

i have a t Mobile HTC One. My wife has the exact same phone and she updated hers just fine. When I download the update, it worked but if fails when installing it. HTC sync Manage doesn't read the phone is connected at all. so I can'e even side load the update. I'm open to ideas. I even did a factory reset and that didn't work.