Problem solved. Apparently this skethes only for faces-modules, not for Core-module.
You should be more specific in progrmamm description. Whatever, thanks for answer.

@progman I was told by one of our engineers that gpio5 is the interrupt pin on the faces kit

we are very sorry,for some reason, FACES micropython code has been lost

Hi...I think they must have been using loboris's micropython version, as I haven't seen any of our engineers using or suggesting this function. in the forum you linked to it mentioned something about the webrepl, I have seen various guides on how to do this for esp32, but haven't tried it myself on the m5stack yet.

pcb manufacturing and assembly

Yes, you can custom serials of blocks for FACES Kit.

Thank you. Yes I have this one; the FACES keyboard I am able to get to working with this code. I have however not been able to found any code examples for the FACES calculator face that will compile without error for Arduino IDE. Anyone??

@watson Thank you for the reply. I will try with "flow.m5stack.com" or offline.