Unable to get older Photon to run any firmware

[nrobinson2000]

Can you try using the mode command to change the baud rate to 14400?

This will put the photon into dfu mode and works pre USB commands.

Electron Mode Button

If you intend to use USB anyway you can always use the magic baud rate 14400 for the serial port to force the device into DFU Mode On Windows you’d just use mode COMx 14400 where COMx stands for the serial port Windows assigend to your device. Programattic ways are WiFi.listen(); // for WiFi devices System.enterSafeMode(); System.dfu();

If you can get the photon into DFU mode on the remote machine, try running the following to update the firmware on the photon:

particle update