Ok
- place the device in DFU mode
- download https://dl.dropboxusercontent.com/u/36134145/particle/junk.der
dfu-util -d 2b04:d006 -a 1 -s 34 -D junk.der- download https://s3.amazonaws.com/spark-website/cloud_public.der
dfu-util -d 2b04:d006 -a 1 -s 2082 -D cloud_public.der- reset the Photon