Hey, thanks for you guys responses, I have already worked out this problem. It seems like the PUYA P25Q32H-SSH-IT is not working very good with the stub mode, I change it with a GD25Q32CTIG an it works smoothly.

Hello everyone, I'm using a self-designed ESP32C3 core board, I can download and run the code correctly with the "no stub" option like the image below: no_stub.png but without the "stub" the download speed is extremely slow, when I enable the download stub option and then run the flasher, it seems l...