Electron breathing magenta

[Moors7]

Have a look at this topic to see a neat explanation of Safe Mode

Safe mode explained

The Particle Photon, P1, and Electron support safe mode, breathing magenta. Safe mode allows network connectivity but does not run your user firmware. This is most useful when you want to OTA (over-the-air) cloud flash code to your device but: You have a program that runs with the cloud connection turned off Your program uses sleep mode to save power You have a bug in your code that prevents cloud access (breathing green) Entering Safe Mode (Photon) You enter safe mode by holding down RESET …

Try a particle update while in DFU mode