I had a similar issue in trying to uninstall the TelestreamAudio.kext for ScreenFlow. What might be happening is that the kext in StagedExtensions is currently in use or protected while you're in regular mode. Once you get into Recovery mode, you can delete it without disabling System Integrity Protection. The following steps worked for me, though please use caution.
- Click the menu. Select Restart
- Hold down command-R to boot into the Recovery System
- Choose Disk Utility from the Recovery Menu
- Within Disk Utility click on your main hard drive (e.g. Macintosh HD) and then click on Mount
- Exit out of Disk Utility
- Click Utilities in the menu bar and select Terminal
- Use the following commands:
.
cd /Volumes/Macintosh\ HD/Library/StagedExtensions/Library/Extensions/
rm -rf NAME_OF_EXTENSION.kext
- Close the Terminal app
- Click the menu and select Restart
From there on, I was able to reinstall ScreenFlow's audio kext and it worked. It may also help you completely remove the Parallels kext.
