We have updated the recovery method, please refer to：
https://files.seeedstudio.com/wiki/mmwave-for-xiao/mr60/Radar_Firmware_Recovery_Method-Jlink.zip
And, we have clearly labelled the risks on the documentation in the hope of reminding people not to use the wrong firmware illegally. Even if there is a way to recover it, the price to pay is extremely high (e.g. you need to buy a JLINK)