Firmware upgrade of pytrack removes USB

[Zinoex]

Hi

I ordered 2 fipys and 2 pytracks, and I followed the instructions and started by upgrading the firmware of the pytrack.
However, once I upgraded the firmware, the /dev/ttyACM0 device vanished, and therefore the fipy is unusable through the updated pytrack. The other (not updated) pytrack still works and shows the /dev/ttyACM0 device once connected, and the REPL loop works on that unit, but the other one obviously doesn't.

The firmware was updated on linux with dfu-util which say the process was successful.

OS: Ubuntu 16.04
Desktop environment: Gnome 3

Does anybody have any suggestions to fix the issue?

[catalin]

hi @Zinoex, just to understand what you did.
So, following these instructions https://docs.pycom.io/chapter/pytrackpysense/installation/firmware.html, you successfully dfu-util updated Pytrack?

I suspect, Pytrack was not successful updated, and remained into bootloader mode. Could you try lsusb command (or any to show the USB devices connected), so, to check if a device comes up when you connect the faulty Pytrack?
Use on the Pytrack (no Fipy inserted), and maybe try to repeat dfu-util command.

[Zinoex]

Hi @catalin
Yes, I did follow these instructions.

I did just that, and the usb device does not show. I also tried to repeat the dfu-util command with no success.
I don't know if the hardware or is faulty (did not ls /dev or lsusb before updating the firmware to ensure that the hardware work). However, dfu-util does not work when the pytrack isn't connected, but it works when it is connected, as you would expect. I buggles my mind, how you can flash something that lsusb doesn't acknowledge.

Do you have any suggestions?
Best regards
Frederik

[Radec]

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