If they have been modified, Yosemite will no longer load the driver. Kext signing works by checking if all the drivers in the system are unaltered by a third party or approved by Apple. Full explanation here: Following steps are assumed that you read the URLs above already: Updated on 22-Oct: If this is your first time of Yosemite, you have to understand the key change versus Maverick: In MAC OSX 10.10 (Yosemite), Apple has introduced a new security policy called kext signing. So, I guess that something wrong with the USB 3.0 driver, and I found out same thing here, and now USB 3.0 is back to work! Summing up, you need to delete GenericUSBXHCI if it's installed in /S/L/E, delete it and download new driver here & install it by using Kext Drop etc. Updated on 21-Oct: I realized that Bluebooth issues are not caused by Bluetooth but by USB3.0, because I plugged Bluetooth USB into USB3.0 port, and moving to USB 2.0 port works. Two days has been passed, so I decided to give up Chameleon/Multibeast and move to Clover bootloader. With repeating, or USBMSC Identifier (non-unique)., and all the solutions mentioned with googling doesn't solve these issues, so I made conclusion that Unibeast 5.0.1 + Multibeast 7.0.0 is not the solution at least for me. With repeating, or BUG in process suhelped. Mutibeast 7.0.0 installation generated the booting error: Still Waiting for root device. Yosemite has finally announced on 17-Oct, but the migration from Maverick to Yosemite is not easy than I expect with following reasons: 1. Please refer the link above to understand my environment.
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