I thought I had cracked this... but no...
Searched the forums and found this
I followed the instructions (seems to follow equally well for Photon.
Downloaded Zadig and ran that.
Removed the old Photon driver via Device Manager, installed new driver via Zadig and thought I'd have success, but still getting the:
!!! I was unable to detect any devices in DFU mode...
Your device will blink yellow when in DFU mode.
If your device is not blinking yellow, please:
- Press and hold both the RESET/RST and MODE/SETUP buttons simultaneously.
- Release only the RESET/RST button while continuing to hold the MODE/SETUP button.
- Release the MODE/SETUP button once the device begins to blink yellow.
When the Photon is flashing yellow.
... help?