Sorry for the trouble, please try the following method to recover Xiao
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Turn on verbose upload in the Arduino IDE preferences
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Plugin Xiao, it won’t show any COM/serial port.
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Open up the blink example(Examples->Basics->Blink)
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Select the correct board in the Tools menu,seeeduino Xiao. (physically check your board to make sure you have the right one selected)
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Compile it(make sure that work)
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Click “Upload” to attempt to upload the code
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The IDE will print out a bunch of COM ports as it tries to upload. During this time, double-click the reset button, you’ll see the red pulsing LED that tells you its now in bootloading mode
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The board will show up as the Bootloader COM/Serial port
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The IDE should see the bootloader COM/Serial port and upload properly