nRF52840 no upload, no bootmode, no folder, just red and blue led on

Products & Technology XIAO
8

Try this method.

Carefully follow the steps below. With luck, it will be restored.
Maybe “Seeed XIAO nRF52840 Sense” or “TinyUSB Serial” will appear with a different name in your device manager.

  1. Is“Seeed XIAO nRF52840 Sense" or“TinyUSB Serial”listed under“Universal Serial Bus Devices”in the Device Manager?
    Note: not “Ports (COM & LPT)”.
  2. If not, this method does not work.
  3. If so, right click “Seeed XIAO nRF52840 Sense”or“TinyUSB Serial”, and “Update Driver”
  4. select “Browse my computer for drivers”
  5. select “Let me pick from a list of available drivers on my computer”
  6. select “USB Serial Device” and click “Next”