I'm dusting my lightning ATM which I built from a kit. It has a Wifi password stored on the Raspi-Zero which is different from the current one I use. So need to find an elegant way to reset the wifi password without dismantling the device to have access to the board and reflash. In need to find the old wifi password, set it on the router and check if the ATM connects. Yes, that's my plan. Now onto guessing the old router password.