Same issue for me… My photon breathes cyan, is show as offline, but I can trigger a “signal” from web IDE and it’s works! (but I can flash any program… Request Timed Out).
I tried many way to flash my photon, but nothing is working…
Place it in Safe mode and try again.
I already try in Safe mode, same issue (my photon/P0 is just out of the box)
Other thing very strange, I got all information into particle ios app (Last heard, IP, etc…) I can trigger also trigger a “signal” but can’t flash tinker…
And when I reset the Photon, I got the “status icon” in ios app in cyan during 1sc and after it will stay in grey
Is there a resolution to this? I found one of my Photons that I got a couple years ago and tried for 4 hours to get it functional.
Using the Particle android app I can set up the Photon, configure it to my WiFi and even give it a name. Then it goes offline but breathing cyan. If I bring up the web console I can see that it has been seen by the cloud. If I click the locate button in the IDE I get a pretty flashing LED.
Its not spotty WiFi, I have a new netgear WNDR3400 sitting on the desk I’m working at. I have no idea how to read what firmware version is on it, and the tutorial that I did find for loading new firmware is out of date and… complex for someone trying to figure this out.
Anyone have any suggestions?
Try placing it in safe mode
Updating firmware with most recent CLIs (current version 1.23.1) is easy
- put the device into DFU mode
- execute
particle update(should end up with system v0.6.2) - optionally revert to tinker with
particle flash --usb tinker
Many thanks, @ScruffR, this pointed me in the right direction.
In an attempt to help the next poor schmuck who is in over their head, I offer what worked for me, with no warranty, implied or otherwise. 
Go to
https://docs.particle.io/guide/tools-and-features/cli/photon/
for a guide to the Command Line Interface (CLI), as of 7/20/17, there is an official Windows installer that you can download which will take care of all the dependencies rather than sending you all over the web leaving you hoping that you got the right ones.
Get your network ready, and be sure you have a phone with the Particle App installed on your network.
Power up the Photon with a USB cable plugged into the Windows machine.
Go to
https://docs.particle.io/guide/getting-started/modes/photon/#dfu-mode-device-firmware-upgrade-
for a description of Device Firmware Upgrade (DFU) mode, and how to put a Photon into this mode. Yellow is perhaps an optimistic description of the color, I see half Green, half Red.
Now that the Photon is in DFU mode, open a command line window on the Windows machine, and execute the command "particle update".
I actually did this twice, the first time I got a error:
My Photon was left in Breathing Blue mode, so I tried configuring it with my phone anyway. This time when the configuration was complete I was graced with a Green dot and an "online" indication.
I opened
and selected the "Blink an LED" sample code, then clicked on the compass icon to select hardware. If you have successfully claimed a Photon, it should appear in this list. Clicking on it and tapping the "signal" button should make the status LED on the device dance. Even better, since the upgrade, it will show you what Firmware is on the device, just above the Signal button, as well as at the bottom right of the window. This means that when you DO move on to programming the next step, you know what the target firmware is, rather than taking a shot in the dark.
I actually ran the "particle update" command a second time while typing this up to be sure I didn't miss a step, and did NOT get the invalid suffix error, YMMV.
My phone can now toggle Pin D7 using Tinker, and after pushing the lightening bolt icon to flash the Blink code, I now have a blinking LED.
I hope this helps someone.
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