Thanks Critical for your great guide. After I try everything again to reinstall El Capitan. The issue of reinstalling CustomMac Essentials.pkg again and again is solved.
At the moment, I still can't get the audio work, since I use only usb audio, this issue actually doesn't matter to me.
I also can't get the bluetooth work. Redessence, please let me know how you do it.
My USB 3.0 is also not working. Precisely the usb 3.0 port works, the scenario are as follows:
1) Put USB 2.0 drive to USB 3.0 port ---- WORKING WELL
2) Put USB 3.0 drive to USB 3.0 port ---- NOT WORKING
3) Put USB 3.0 drive to USB 2.0 port ---- WORKING WELL