Photon 2 not detected over USB (no serial or DFU mode)

Getting Started
1

Device: Photon 2
Problem: My Photon 2 powers up (blue LED flashing — Listening Mode), but it’s not detected by any computer over USB.

What I’ve tried:

  • Multiple known good USB data cables
  • Multiple computers (macOS, Raspberry Pi)
  • USB ports confirmed working (mouse, keyboard, etc.)
  • Tried both Listening Mode (flashing blue) and DFU Mode (solid yellow)
  • No /dev/ttyACM*, no detection in lsusb, and no logs in dmesg

What I observe:

  • Photon powers on, LEDs behave normally
  • No USB activity or enumeration at all
  • Other USB devices show up fine

Questions:

  • Is this likely a hardware failure (USB data lines)?
  • Is there a way to recover via UART?
  • Should I request a replacement?
2

Failure of the USB port is rare, but from those debugging steps it, that's what it looks like to me, and I don't have anything else to try.

You cannot set up by UART. Theoretically you could set up by BLE, but not having a working USB port will make the device very difficult to use, and it's unlikely that reinstalling software would make the problem go away.

3

Hi, do you have other Particle devices? Do they show up in USB?

From what you describe, this has very low chances of working, but what if you try the restore tool?

4

thanks!

5

Gents;

Quick update - I borrowed my friends micro-usb to usb cable and everything worked, the device registered just fine. Doesn't make sense to me, but I can see the photon 2 in /dev/tty* and dmesg, and configure using the cloud tools and VSCode apps.

If anyone else is having trouble, it could just be the usb cable you are using!

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