Cannot flash the firmware for ratdgo using the web utility

Hardware
3

For Ubuntu at least (and for me) I’ve got it working.

  1. Something called britty was blocking me from using the correct serial port, I wasn’t even seeing Serial ttych341usb0 when I first read your post.

  2. I found other reports of the same issue, which led me to this guide

  3. I updated the britty rules with the following command and rebooted
    sudo ln -sf /dev/null /etc/udev/rules.d/85-brltty.rules

  4. Then I could see the right serial port for the ratgdo but still got the failed to open serial port error

  5. I figured it might be a permission thing at this point and found this post describing the same issue for a similar ESPHome device

  6. This gave me permission and then it connected on my next try
    sudo setfacl -m u:USERNAME:rw /dev/ttyCH341USB0