I tried to put a Photon into Safemode by pushing both buttons and releasing the reset button as immediately after the status LED flashes magenta. Then the whole startup sequence starts, finally ending into flashing green and then cyan. From then on the device continues flashing cyan, interrupted by some red flashes after a while and then continuous flashing cyan again. And this goes on forever.
Then I have put the device into listening mode (blinking blue) and I tried to do a complete new setup (through the particle app). All seemed to work fine initially, but the setup sequence did not complete the last step: Verify Device Ownership, with the status LED breathing green.
Is there anything that I can do to resuscitate this Photon, or is this Photon dead forever?