Updated drivers for CH34x chips in OSX

If you own a device that has the CH340 or CH341 USB to Serial chip to communicate with your mac and after updating to version 10.11.2 (El Capitan) your board is suddenly not detected, please download the updated drivers.

This chip is quite common in cheap Chinese Arduino Nano and Uno clones. Since June 2015, in collaboration with WCH, the manufacturer of the chip, we were the first worldwide to offer drivers that were working with OSX Yosemite and later El Capitain. The update of El Capitan to 10.11.2 broke the previously offered drivers.

The drivers now available work in all OSX versions starting from 10.6.


  1. microtherion

    23 Dec 2015 05:31:39

    Unfortunately, the latest CH340 drivers are causing a 100% reproducible kernel panic for me whenever a device gets plugged in.

    • Giannis

      23 Dec 2015 20:17:49

      We haven’t ever seen a kernel panic with these drivers and we have tested a good number of boards on OSX 10.6 to 10.11.2. Mind sending a ticket to support? Don’t forget to also let us know the name of your board.

      • microtherion

        24 Dec 2015 03:40:38

        Thanks, done (although the “board name” part is quite vague, as one would expect with a CH340 based board).

  2. Charlie

    22 Mar 2016 03:56:09

    My FTDI driver remains broken so I can’t use my Genuine Adrunios. This fix did work for the CH340 but not for the FTDI.

    Could you fix this? I filed a supprt request.

    • Giannis

      22 Mar 2016 11:43:08

      Updating the CH340 drivers didn’t change anything to the FTDI ones so if you’re having problems we’ll be glad to see what we can do with that. Please make sure you sent us at [email protected] if you haven’t already.

  3. Jeff

    18 Apr 2016 17:02:44

    Driver reinstallation is not possible with the current website. If the drivers are already installed, the “download drivers” link (page 3 of getting started) quickly disappears and the site goes to the testing phase (page 4). I could not re-download the drivers.

    • Fotellos

      21 Apr 2016 11:20:56

      Hey Jeff! You get redirected to the testing page because we detect that you have already successfully installed the drivers. You can always download the latest version of the Mac OS X driver installer here.

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