I have an application that I wrote using the initial Particle SIM card which works well.
We plan you use an AT&T SIM card for ongoing network connectivity. I have followed the setup.particle.io procedure entering the SIM ID and APN, then downloading the firmware.bin file and uploading it the Electron board as described.
The Electron goes through its initial LED colors and eventually goes to the breathing cyan color…Good.
But now my application no longer seems to work! Do I need to re-flash my user code after I execute the new firmware.bin upload?? Am I missing something else??