I still cannot get to work with the Electron in listening mode.
updated particle-cli
Chose Electron a the target on “devices” in the Cloud IDE
built firmware.bin using the Cloud IDE
downloaded firmware.bin
put Electron in Listen mode
tried to " sudo particle flash --serial firmware.bin"
Also tried w/o sudo, no difference.
Sometimes I get an “undefined” error, sometimes I get the Assertion failed error.