Have you installed the MiniCore board package from the board manager?
If not you need to install it.
What did you download?
To install the Minicore board package, you only need to follow these instructions: minicore how to install.
I've done it, and loaded it to the IDE. I don't know how to set it up
Done but how to set it up?
Note that I have no experience with your board nor with Minicore.
I think that for upload over USB only the board (ATmega328) and the variant (328PB) are relevant.
If you set the Clock to 16 MHz external, the default baud rate is 115200. If uploads fail, a likely alternative choice would be 57600.
I did ask you before if there is any print on the chip closest to the USB connector; you did not provide an answer.
Thinking about it, I'm actually not even sure if Minicore will solve your issue as your board should act as an Uno if it's sold as an Uno.
The name of the chip closest to the usb connector is ch340g
Hi @vennnnnn. Please try this experiment and then report back with the results:
This procedure is not intended to solve the problem. The purpose is to gather more information.
- Connect the Arduino board to your computer with a USB cable.
- Press and release the button on the Arduino board that is marked "RESET".
Now please reply here on the forum thread with the answer to the following question:
- Did you see the "L" LED blink multiple times quickly immediately after you released the "RESET" button?