Electron constant red blink

I have an Electron which I have already successfully set up and programmed (successful blink). Now it is stuck in a mode I can’t get out of. Cold boot gives breathing white - blinking green - blinking blue - fast blinking blue, and then a constant red blink about 2 times per second. No SOS. I can put the Electron in safe mode and in listening mode and CLI works. However, I can’t get it to boot to anything other than this constant red blink.

I don’t know that color code, could you post a video of the whole startup including at least 10 sec of the final stage?
You have already tried flashing Tinker again and it still does that?

@aclaibor, have you tried re-seating the SIM?