Thanks, Baozhu, per your request, here are some images (I hope they come through this way)
If I press the Xiao reset once the femto disappears and then reappears when it comes out of reset. Note that there are NO serial devices listed.
When I double press the reset, it enters download mode and I see this on the Device Manager:
Note here that the femto has changed to a Xiao in Other Devices, and a COM9 has appeared showing a “Teensy USB Serial”. I also get a Win dialog box asking me if I want to open the folder to views the files. This folder contains three files: INFO_UF2.TXT, INDEX.HTM, and CURRENT.UF2. Once the sketch is uploaded com ports and the dialog box disappear. Trying to invoke the Arduino Serial Monitor returns a Com port not available message because it is gone.
