Just in case you missed it, you must reboot the computer after installing the drivers for them to work.
HOW TO INSTALL ONEPLUS ONE USB DRIVERS FOR WINDOWS OS The drivers we are downloading during the guide are for Windows PC only and will work on the Microsoft Surface tablet/laptops, normal MS laptops and desktop PCs. That said, you will of course need to have a Windows PC and your OnePlus smartphone handy for use. You are safe to follow the guide below without backing up the smartphone or taking any precautions. Today I’ll show you an easy way to fix that.
If you are having trouble getting your OnePlus smartphone to work on the computer it’s probably because the USB drivers are out of date or not working properly. While that’s nice, there’s still a bevy of reasons one will want to connect the OnePlus handset to the Windows computer. The OnePlus One smartphone sports Qualcomm’s quad-core Snapdragon 801 coupled with CyanogenMod 11S UI which is handy for saving time having to install custom ROMs.