Just got my XIAO today and have tried all the various suggestions as to why it will not program. I can see it after downloading the correct driver. Arduino IDE will report the device serial number, so I know it is talking to the part. It just never connects and programs.
Also, as an aside, allmost all the example programs in the Arduino IDE fail to compile. Not sure if that is intentional.
So what is next? I have ) installed “signed driver” file and Windows does recognize the device. Got Arduino IDE to verify serial number.
The Arduino IDE just stops forever trying to connect to the device. After a very long time it says it failed to connect.