Where are USB serial drivers installed on the Mac? How can I check which drivers are installed, and how do I remove a driver?
Hardware Drivers in OS X are typically in the form of Kernel Extensions and the primary location is
/System/Library/Extensions/ however they can also be within an Application Bundle. You can use
kextunload to unload a Kernel extension. To see what Kernel extensions are loaded use the
kextstat command in a Terminal.
Unloading a Kernel Extension with kextunload
Unloading a kernel extension from OS X is basically the exact same as loading a kext, except you’ll use the kextunload utility with sudo as follows:
sudo kextunload -b com.apple.driver.ExampleBundle
Or by pointing directly to the kernel extensions path:
sudo kextunload /System/Library/Extensions/ThirdPartyMystery.kext
Again, you can confirm the kernel extension has been unloaded by using kextstat and grep, where it should return nothing.