Posting some updated information. The condition, as noted above, is that one of four ESP32-D0WDQ6 based boards starts an upload automatically while the other three require a BOOT0 button press, something that appeared to have started while working my way through some tutorials. I was thinking that I...

Thanks for the info and the link. That explains a lot, more than I understand, in fact. The action on this one board (an ESP32 Thing) appears to produce a reliable auto boot mode but it will require a bit more investigation to find out why or how it got into that mode. The unreliability mentioned in...

This appears to be a simple question for this forum, but I have a couple of boards with the ESP32-DOWD chip. One requires the BOOT0/GPIO0 switch to be pressed/grounded in order to start an upload and the other does not require this and the upload proceeds without any intervention. Why the difference...