How to update the firmware in TellStick and TellStick Duo using Mac OS X

Open the terminal. Run the following command:

sudo launchctl unload /Library/LaunchDaemons/com.telldus.service.plist

You need to enter your password.

Now you can run the flasher utility, which can be downloaded here: (yes, despite its name it works for TellStick and TellStick Duo too)


Q: I have updated the firmware in TellStick Duo, but want to downgrade again. How do I do that?
A: Download an older firmware (, stop the service as described in the guide, drag-and-drop the .hex-file to TellStickFlasher.exe (located in your TelldusCenter installation folder), and follow the instructions.