As the title suggests, it's blinking blue and when put in DFU mode and trying to reset firmware, it cannot.
How are you putting the Photon 1 into DFU mode?
Try this alternate method: Disconnect USB. Hold down the SETUP button while plugging in USB power and continue to hold down SETUP. The status LED should blink magenta (red and blue at the same time). Continue to hold down SETUP until it blinks yellow, then release.
How far can you get along that procedure?
Thank you for getting back to me so quickly. I have no problem getting it into the DFU mode, the problem arises when using setup.particle.io. It updates the firmware on step 4, but doesnt blink green.
So in Step 2 it did successfully go into blinking yellow (DFU) and update the firmware?
Did you get prompted to select your Wi-Fi network SSID and password?
Did it switch to blinking green before going back to blinking dark blue? If so, does your Wi-Fi network use WEP encryption or have a SSID or password containing non-ASCII characters? This can be a problem with the Photon 1.
If you didn't get prompted for your password, or after entering it the status LED did not change, you should try the Web Device Doctor and see if it returns an error code.
I might have run into something similar before with an older Photon, not sure if it's the same.
Does it work if you download this binary: https://github.com/particle-iot/firmware/releases/download/v0.7.0/bootloader-0.7.0-photon.bin
Put the Photon into DFU mode, then use the Particle CLI to flash it: particle flash --serial bootloader-0.7.0-photon.bin
And after that, try running through the web setup process again.
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