If you’re using an Apple computer, you may get the following error message:
The text of the message reads (provided for screen readers):
System extension cannot be used
The system extension “/System/Library/Extensions/AppleUSBEthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update.
This problem is apparently the result of a recent iTunes update and it is impacting many people.
Follow these instructions to fix the problem:
- Disconnect your iPad, iPod, or iPhone from the computer.
- Download the latest iTunes software.
- Using Finder, navigate to the System folder, then Library, then Extensions and find the AppleUSBEthernetHost.kext file. Move it to your desktop. This will remove it from Extensions.
- Install iTunes using the download from step #2 above.
- From the Utilities folder in Applications run the Terminal program.
- Enter the following command to update the extension. This should all be typed on the same line and then press enter/return. There is a space between kextload and /System…
sudo kextload /System/Library/Extensions/AppleUSBEthernetHost.kext
Restart the computer just to make sure all changes are saved.