The README.txt file in the firmware directory says that in order to manually get the board into DFU mode, I should connect the BOOT0 pin on the debug header to GND. So far I was unable to locate any debugging header on my OpenMV. I did find a pin labeled BOOT, but tying it to the ground doesn’t make the board go into DFU on startup. Any advice?
I can’t flash the firmware with IDE anymore or get it into DFU mode from REPL, because I flashed the OPENMV2 version of firmware and I no longer have REPL on it.
With one of them it was failing to init the sensor, and with another, failing an ADC test. It did mount as a USB disk, with ERROR.LOG file in it, but there was no REPL in either case.
Anyways, I have this solved and the board works now. Thank you for clarifying this.