Unknown Carrier Upgrade?

[BigDinCA]

Ok. I did a little research for you and Verizon is a small partner for GSC. They are one of Verizon's roaming partners around Yosemite. I would imagine that you would wnat to update to a Verizon ROM first. That may help. If nothing else, try your tech support again and maybe let them know that you know they partner with Verizon. Maybe they can get you to some Verizon tech support. This is gonna be a tough one, because their website has no info on updates for your phone, nor does HTC's. You could always try calling HTC as well, but I've never done that, so I don't know if that would help you. The point is, it looks like you have a CDMA version of the phone, and that's a start.