USB driver for Hytera 685 can be downloaded from HAM-DMR.nl
Make sure you choose 32 or 64 bit depending on your computers hardware.
Using 7zip or winrar or winzip open the file
Double click on folder DMR_SW_usb driver......
Double click on the DMR_SW_usb driver folder
Double click on driverinsstaller
You should now see a long list of files
Double click on setup.exe
Be patient can take a couple of minutes
Click on OK