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    Without commenting on the legitimacy of the linked software, it should be noted that a CH340 driver will only work on boards using a CH340 or CH341 - it will not help for boards using an FTDI part or an ATmega16u2. Blind installation is probably not to be recommended. Commented Jan 9, 2017 at 23:04
  • I think if this kext is signed by Apple, they trust it, aren't they? Commented Jan 15, 2017 at 20:39
  • Regardless of who allegedly signed it, that driver will not help anyone who doesn't have a CH340/CH341 or functionally identical adapter. The actual Arduino Nano uses an FT232RL chip, requiring a different driver (which may well be built in). The point is to figure out what you have before installing drivers - this can be determined either by reading the part numbers or from the USB tab in system report. Commented Jan 15, 2017 at 20:43