I got a used sonicwall (R650). The unit has already been programmed - tried both GUI and SSH login super sp-admin. Doesn't work for either. I tried the reset button - 10 or 30 seconds - it will not reset the unit the way others I've used in the past do. The previous owner may have pushed down too hard on it or something - I really have no way of knowing. I purchased 12 others and so far no issues with resetting them with the button.
I was just curious if there was an easy trick to resetting the reset button so to speak.
Hope you are doing well !