Yes, it was the CLI that i have installed.
While screwing around with it I have powercycled it many many times so may have corrupted something in this one.
Ive tried many things from various threads in DFU mode but they all seem to fail with similar messages.
Invalid DFU suffix comes up with almost any of the commands.
This is the particle keys doctor command. First is in DFU blinking yellow, second is with it not, so it clealry is starting to do something when in DFU but then it fails with that same suffix error.
I got it to the stage after unclaiming the device and trying to add it again that it was flashing cyan many times then a single red flash and found this thread Using Device Doctor with Photon: Command failed: dfu-util... etcetera so tried the commands in it.
I also end up with a lot of _rsa_new.der, _rsa_new.pub.pem and _rsa_new.pem on the desktop along with some backup files similarly named.
Trying to flash tinker from commandline gets this, first is when in DFU and second is when not in DFU
