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

[msfujino]

The openocd should use “0.11.0-arduino2”, but your log seems to use “0.10.0-arduino7”.
The folder “0.11.0-arduino2” is located at /.adruino15/packages/Seeeduino/tools/openocd/.

If you have another XIAO_SAMD21, the method in the link below is easy and successful.

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…