![]() Restore original files, rebuild system caches and reboot. If you used the first workaround described in Posts 1 & 2, undo it all.On real Macs, you have to disable SIP first ( See here). Remember, if you're not familiar with kext installation or modification, do backup first, especially if you're trying this on your main system. You can do the mods yourself, or use the attached file. I added previous Yosemite versions of AppleUSBEHCI.kext, AppleUSBOHCI.kext, AppleUSBUHCI.kext, AppleUSBXHCI.kext ( taken from IOUSBFamily.kext Plugins folder, from a clean install of Yosemite 10.10.5) inside Plugins folder. I removed AppleUSBEHCI.kext, AppleUSBEHCIPCI.kext, AppleUSBOHCI.kext, AppleUSBOHCIPCI.kext, AppleUSBUHCI.kext, AppleUSBUHCIPCI.kext, AppleUSBXHCI.kext, AppleUSBXHCIPCI.kext from Plugins folder. So I did the following modifications on the attached file : this is a IOUSBHostFamily.kext from a clean install of ElCapitan 10.11.5 : My system is USB 3.0 based, so it's using XHCI, maybe older systems are relying on older EHCI OHCI or UHCI. I suspected the M-Audio driver was not using the whole IOUSBFamily and plugins, and checking the IoRegistry in Yosemite I saw that the M-Audio kext was simply relying on AppleUSBXHCI.kext ( found inside the Plugins folder of IOUSBFamily.kext in Yosemite). I've had more time to further experiment : my attempts to modify the Fast Track Ultra drivers all failed.īut I've found another way, much cleaner, much lighter. ![]()
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