@felmue
Hello.
Sorry, but why did the engineers make GROVE C if in this situation it is absolutely not usable and useless?
I wanted to use this connector in my project and encountered the same problem. Okay, I tried to use UART on pins G3 and G1 and it was also not usable (as I understand, these pins are connected to the usb programmer).
Yes, I admit my guilt that I did not fully read the description, but.... one way or another it is funny and sad.
And this was my first experience with M5Stack, obviously unsuccessful lol