I am having the same issue and I did a few things including flashing tinker (particle flash --usb tinker), bootloader (particle flash --serial bootloader-0.7.0-photon.bin), etc. but the device still has the same old program running!
Any update on this issue?
When I do update I get an error:
particle update
> Your device is ready for a system update.
> This process should take about 30 seconds. Here it goes!
! An error occurred while attempting to update the system firmware of your device:
File too short for DFU suffix
A valid DFU suffix will be required in a future dfu-util release!!!
Error during download get_status
> Please visit our community forums for help with this error:
https://community.particle.io/
Cannot read property 'code' of undefined