Gsm unlocked but cdma not unlocked,hotspot and screen mirroring not working

I have a HTC one m8 verizon unlocked phone,which has gsm unlocked to any world network but
The CDMa is limited to verizon
So can I unlock it?If yes than How?
My Hotspot and Screen Mirroring is also not working.
Please tell me how to make them work
Current android version 5.0.1
Will I be able to update it to 6.0?
I am really new at this
Need HELP.