@ciconde I have an M5Stack Core2 AWS working with the GoPlus2. I'm using Arduino not the UIflow. The issue I worked around was that the Wire Bus there are two I2C buses on the Core2. The demo code is set for Wire.begin() which is the wrong bus for the Core2. I changed the code in my copy of GoPlus2.cpp which was on GitHub and changed all references of Wire to Wire1 although to make it easy to swap it back I made a #define WIRE Wire1 and replaced all the Wire.function with WIRE.function. For example WIRE.begin() or WIRE.write(angle).
I've tested this with 9 volts into the GoPlus2, running two different 180 degree servos.