How to unbrick a dead XIAO using ST-LINK and OpenOCD

[msfujino]

Hi, Pedotech
I’m glad I could help you.
You may also find the following link useful.

How to unbrick a dead XIAO using a XIAO(DAPLink) and OpenOCD

The bootloader area of a XIAO is not write-protected when it is shipped from Seeed. If this area is overwritten for any reason, a XIAO will lose its COM port, will not respond to “double reset”, and will be bricked. A bricked XIAO can be repaired by re-writing the bootloader. All I needed was a XIAO uploading “simple_daplink_xiao.uf2”, OpenOCD that comes with Arduino IDE, and some script files that I attached. Connect a bricked XIAO and a DAPLink_XIAO with four wires, and double-click “flash.ba…