Photon stuck in loop: flashing white fast ->brief red->brief green

This photon is at a remote site with a client and it was powered off for one month while the client was on vacation. After repowering with no other changes the photon is stuck in a loop that last 5-6secs. Any suggestions?

Place it in Safe mode if possible.

The SSID programmed on the Photon might not be available as well so that’s worth checking.