Hi,well THAT's really an easy way! However isn't "touch" and "hold" to be exchanged?Christoph
when the firmware runs it makes the HWB pin an output (DTR) and it may be high, and connecting it to GND may cause a short.
With the extra 10k resistor in place HWB is held low whenever it is configured as an input. Does this mean the 8U2 chip goes into DFU mode on powerup? And how do you get it out of DFU mode?