Having an issue with Firmware

[paul-unterweiser (undersearobotics.com)]

“No IO heart beat” usually means that something is corrupted on the SD card. The fix is to pull out the SD card from the Pixhawk and reformat it with your computer. Here’s a thread where we helped Heinz with the same issue: https://discuss.bluerobotics.com/t/last-qgc-bug/