Unable to Pair Photon with Tinker App

Hi,
I have tried following steps for key issue:
1.) connect your device, and place it into Listening mode (flashing blue), type particle identify to get the device id.
2.) reset your core and place it into DFU Mode
3.) type particlekeys doctor your_device_id
4.) then type particle keys send [your_device_id] [your_new_key_file.pub.pem]

At the end the key was submitted successfully, then the device restarted, but still i am having orange blinks followed by Cyan…

I also followed steps in [SOLVED]Photon fast blinking cyan (with a random red burst)
but same error…

then i tried this:
Download the server public key from https://s3.amazonaws.com/spark-website/cloud_public.der101
CMD>> dfu-util -d 2b04:d006 -a 1 -s 2082 -D cloud_public.der

What should i try more ?

Regards,
Burhan