Arduino Nano no serial port for MacBook Air 2013 Problem

I have an Arduino Nano connected via a USB cable (Type A to Mini Type B) to my MacBook Air (Mid 2013 Model). The PWR LED is on while the arduino is connected. 

Opening the Arduino software, pulling down the Tools &gt; Serial Port menu does not show me a valid serial port. All I see is:

/dev/tty.Bluetooth-Incoming-Port
/dev/cu.Bluetooth-Incoming-Port
/dev/tty.Bluetooth-Modem
/dev/cu.Bluetooth-Modem


What I've tried and did not work


I have installed the correct FTDI driver (v2.2.18). x64 for my MacBook Air's Corei5, file FTDIUSBSerialDriver_10_4_10_5_10_6_10_7.mpkg. Restarted after installation.
Tried connecting arduino to both USB ports on my Air.


More Info


Running Mac OSX 10.10 Yosemite
Same arduino and cable work when connected to a Windows machine or a Raspberry Pi.


If it helps, I can see the USB Serial in my Apple Logo &gt; About This Mac &gt; System Report under Hardware &gt; USB

USB2.0-Serial:

  Product ID:               0x7523
  Vendor ID:                0x1a86
  Version:                  2.54
  Speed:                    Up to 12 Mb/sec
  Location ID:              0x14100000 / 8
  Current Available (mA):   500
  Current Required (mA):    Unknown (Device has not been configured)


I'm out of ideas and options. Any help would be greatly appreciated.

Thanks in advance :)
This solved it for me.


Download this driver
Install it
Run sudo nvram boot-args="kext-dev-mode=1"
Reboot


Serial ports now showed up in the Arduino IDE and also when I used ls -1 /dev/tty*

Hopes this helps someone.

Reference: This thread