Original driver of the Verizon 4510L not allow USB tether like on the MiFi 2200. Where it can be connected as a modem (tether Cable) when USB cable connected to a PC and WiFi as well continue. Here is a driver update for 4620 Novatel LTE USB Cable for the support of tethering.
Windows OS:
http://production.4620.verizon.mifiupdates.com/Windows/MiFi4620LWin.zip
Size: 7,68 MB
File: Zip
Name: MiFi4620LWin.zip
OS Supports: Windows XP, Vista, Seven
Mac OS:
http://production.4620.verizon.mifiupdates.com/Mac/MiFi4620LMac.zip
File: MiFi4620LMac.zip
Size: 372.87Kb
Hopefully be a little help and thank u for visiting.