I just noticed that after a serial flash of the bootloader the CLI does not return to the prompt [Edit] seems to take a long while to do so > 30 seconds? Using ctrl-c can get the prompt back. Is this is a new fault or a feature?
$ particle flash --serial "firstname.lastname@example.org" ! PROTIP: Hold the SETUP button on your device until it blinks blue! ? **Press** **ENTER** **when your device is blinking** **BLUE** sending file: email@example.com Flash success!