I had added USB 3.0 functionality (via a GMYLE BC628) to my Late 2011 17″ MBP as per my earlier post. Mac OS X 10.11 El Capitan introduced a new layer of security that prevented my previous configuration from working.
Fortunately, others have figured out a road back.
Here are the steps:
- Backup everything and assume you’re about to trash your system. I am not responsible for what happens here.
- Boot in to your recovery partition, or on to a USB installer
- Execute:sudo csrutil disable kext. This disables kext signing. Boot back to your native system. (Note USB-booted environments probably don’t need the sudo component.)
- Download GenericUSBXHCI.kext to your Desktop
- Run KextBeast, install to /Library/Extensions