Firmware MCU STM8S003

It´s possible change the MCU 8-bit STM8S003 firmware? Can we program and use the gpIO from it?

Yes, You can change the MCU 8-bit STM8S003 firmware.
We will release the docs about how to flash firmware for MCU in the future.
Thanks.

Any update? Would really appretiate it if the MCU firmeware is open-source