I have read nearly all threads pertaining to this. My Photon was working great, then just flashed red one time and then went dark. D7 LED went dim and at first thought it had fried itself (unlikely, I know). D7 remains dim. Went through all steps: Unable to put device into DFU mode. Checked the heat spreader, and it is not touching any components, as far as I can tell. Running either 0.5.2 or 0.5.3. Attempted to “jumpstart” with another Photon lying around using SMT and Norwegian_Blue and received “SWD Fault Error”.
Voltages: 3v3 between GND & RST; when RESET is pressed it goes to 0V
3v3 between 3V3 & RST; when RESET is pressed it stays at 3v3
Device ID: 400049000a51353335323536
Is this a dead Photon?