I tried to run Particle doctor because I have a Photon that obviously is in an unhealthy state. I have put the device in DFU mode and after selecting “continue” the system responds:
“An error occurred while attempting to update the system firmware of your device:
Error: Command failed: dfu-util -d 2b04:d006 -a 0 -s 0x080A0000:131072 -U user_firmware_backup.bin
File exists: Cannot open file user_firmware_backup.bin for writing”
…and that the advice to visit the community for help with this error.
Can anybody help me???