@william About topic 1: I do not know that the LoPy has any of that by itself. There is a 3.3V power regulator, but thta cannot handle string interference, which may com in at each and every signal line. Topic 2: The watchdog is software, can handle some run-away software situation. You might need a separate hardware watchdog which pulls reset.

@robert-hh Thanks. I did the os.mkfs('/flash') and then ran Pymate on my phone to re-establish a WiFi connection and reinitialize the chip (repopulating with main.py and boot.py) that I now see in ftp.

@josua Glad you got it working by doing the firmware upgrade procedure again