Here are the USB drivers for the ZTE Vital. I ripped these from my VM Supreme. I could not find them on the ZTE website.
Windows:
https://www.dropbox.com/s/zvpt5pom4hbu2ff/Windows.zip
Mac:
https://www.dropbox.com/s/eh74y88g9l4ynjg/Mac.zip
Linux:
https://www.dropbox.com/s/4yzdmcssib1t29v/USB_Driver.tar.gz
I added these just in case you bricked your phone and cant connect with USB. I know what its like.
Windows:
https://www.dropbox.com/s/zvpt5pom4hbu2ff/Windows.zip
Mac:
https://www.dropbox.com/s/eh74y88g9l4ynjg/Mac.zip
Linux:
https://www.dropbox.com/s/4yzdmcssib1t29v/USB_Driver.tar.gz
I added these just in case you bricked your phone and cant connect with USB. I know what its like.