Something very odd happened that I can’t make sense of resulting in 2 bricked XIAOs.
Converting an existing project from Uno to Xiao. I modified an ESP32 IIC HelTec OLED library to properly exist with the Arduino IDE and compile for Xiao with the old project code. It compiled & uploaded OK but just after a good upload the Com port disappeared and would not return (per Win10 Device Manager & Arduino IDE). Had a spare Xiao so I connected that one & the Com port re-appeared. As a test I loaded another unrelated program and ran it on the second Xiao to assure all was well, it was. Uploaded the new project to the second Xiao and the Com port disappeared again never to return. One such
failure could be a glitch, two is a problem somewhere. Reset & double reset result in fast LED flash. Working on reloading the bootloader but the real issue is what happened.
If you have thoughts on why this occurred I’d like to hear them.