So, most cheap Arduino I can found in Indonesia’s marketplace is basically a SMD version that based on CH340 USB Serial chip.
You can find the drivers on this site here http://www.wch.cn/download/CH341SER_MAC_ZIP.html, but there’s easier way to install the driver if you already have brew installed. (OSX developer must have `brew` installed! MUST HAVE! :P)
First Install cask (OSX developer who have brew also must have cask :D).
Run the cask recipe
brew cask install caskroom/homebrew-cask/wch-ch34x-usb-serial-driver
(it’s basically a script that is doing the driver downloading and installing for you)
Open up your Arduino and make sure there’s new `tty.wch` device listed on the open port.
If somehow it’s still not detected, try to restart and change the cable. The UNO that I receive only have USB with Power (not include data)