Comment by ddeck
5 days ago
It's certainly possible. Tracing the MCUs IO lines to LEDs/buttons/relays etc on a PCB is usually pretty straightforward.
I have just finished doing this and writing replacement firmware for the Aqara E1 series of Zigbee switches, after getting fed up with them not supporting basic Zigbee binding functionality.
Amazing. I have the Aqara Z1s and it has the SI labs MG24 chip. Ive always wanted to reflash it because I believe it supports thread at a hardware level.