Yes, I had removed it from my breadboard. No matter how I reset it, plug and unplug it, the printout just keep coming back. It's so weird..... I worked with NodeMCU-32S and Wemos ESP32 before, it never happened on those boards.

I'm working on this Wareshare E-Paper ESP32 driver board for about a month. A few days ago, after I turned it on overnight it kept printing out "NUL" to the serial shown below. It's still the same after I re-plug the power or press the reboot button. If I try to update a firmware, it just time out. ...