I have a duo that is running the scanning example for ble. It appears to do this quite well but not longer gets on wifi for me to update the firmware. I have tried holding down both reset and setup and then letting go of reset. This causes it to go into blinking blue but am not sure where to go from here.
Breathing white means in Manual mode (check your user App), it will not connect to the Cloud with this mode. If you want to do so, press and hold the Mode button and then resetting the board, release the Mode button when you see Purple color, it will enter to Safe mode and will connect to the Cloud and ready for OTA firmware flashing.