As stated on the troubleshoot page, there is no definite solution for the "Code 43" problem. What happens, is that the Teensy3.0 suddenly (after uploading a sketch) won't install as a "USB Serial" device, but as an "Unknown Device". Strange thing is that the Teensy Loader still uploads sketches (though not automatic anymore). Serial communication doesn't work, and no COM port is displayed in the sub-menu. (All this running Windows 7.)
After a long time of trying a lot of different thing including power-down, windows update and update driver, it suddenly worked again! What I did was "Add Legacy Hardware" in the following steps:
Manage Computer > Action > Add Legacy Hardware > Install Manually from a list > Ports (COM & LPT) > PJRC.COM, LLC > USB Serial > Next > Finish
The strange thing now is that after loading the blink example the Teensy is installed correctly again and my Device Manager now shows two times "USB Serial", one for COM10 (the one I just installed) and one for COM9 (the actual Teensy)
If anyone has more information on this issue, please contribute!
Edit: I notice on one of my untested/incomplete sketches, I get the dreaded "Code 43", while a confirmed-to-work sketch fixes it again... Added the code for potential reference.
After a long time of trying a lot of different thing including power-down, windows update and update driver, it suddenly worked again! What I did was "Add Legacy Hardware" in the following steps:
Manage Computer > Action > Add Legacy Hardware > Install Manually from a list > Ports (COM & LPT) > PJRC.COM, LLC > USB Serial > Next > Finish
The strange thing now is that after loading the blink example the Teensy is installed correctly again and my Device Manager now shows two times "USB Serial", one for COM10 (the one I just installed) and one for COM9 (the actual Teensy)
If anyone has more information on this issue, please contribute!
Edit: I notice on one of my untested/incomplete sketches, I get the dreaded "Code 43", while a confirmed-to-work sketch fixes it again... Added the code for potential reference.
Last edited: