Of the many Photon’s I have recovered from near death this one has me stumped.
- Will not ever go into listening mode (blue flash)
- Reset+Set --> blinks magenta then yellow 7 flashes then 2 sec pause; repeat 7 yellow flashes forever
- DFU mode is not recognized in CLI “Particle update” -> “no detected devices”
That’s probably either a hardware failure or a corrupted bootloader. In either case, you should submit a support ticket. There’s a small chance you could fix the bootloader by flashing a new one by SWD/JTAG, but that’s not an expected LED sequence, so I’d lean toward hardware failure, and the Photon can be replaced.
I will checkout support!