We have 107 Boron 404X’s. I (so far) have one problem child. It blinks green all the time. I’ve tried using the Device Doctor to reflash and that seems to work. But it will not get past blinking green.
What DeviceOS are you currently running? If you are not aware, there is a connectivity issue specific to BRN404X and specific Device OS versions. This is outlined in TAN012. Upgrading to Device OS 5.3.1 or 4.0.3 (when available) or later will have this issue fixed. Cheers.