@ajb2k3 I found a script in

M5Burner-MacOScan/firmwares/UIFlow-v1.2.3/UIFlow-Firmware-1.2.3/firmware_StickC/flash.sh

I had to edit it in several places.

1. my M5Stick-C uses a different USB-serial chip? it shows up as /dev/tty.usbserial-9952009445 instead of /dev/tty.SLAB_USBtoUART.

2. The script didn't have the same filenames as the binaries in the directory, so I appended the addresses in the last line.

There is a copy of esptool.py in the tools folder.

Hope this helps any other MacOS users that cannot get their M5Burner.app to work...
cheers
-chris

Here is my version of flash.sh bash script:

#!/bin/bash

machine=""
port=""

unameOut="$(uname -s)"
case "${unameOut}" in
Linux*) machine=Linux;;
Darwin*) machine=MacOS;;
CYGWIN*) machine=Win;;
MINGW*) machine=Win;;
*) machine=UNKNOWN
esac

echo ${machine}

if [ "${machine}" == "Linux" ]; then
echo "linux"
port="ttyUSB0"
fi

if [ "${machine}" == "MacOS" ]; then
echo "MacOS"
#port="tty.SLAB_USBtoUART"
port="tty.usbserial-9952009445"
fi

echo ${port}

esptool.py --chip esp32 --port /dev/${port} --baud 750000 --before default_reset --after no_reset write_flash -z
--flash_mode dio --flash_freq 80m --flash_size detect
0x1000 bootloader_0x1000.bin
0xf000 phy_init_data_0xf000.bin
0x10000 MicroPython_0x10000.bin
0x8000 partitions_mpy_0x8000.bin
0x170000 spiffs_image_0x170000.img

I'm having the same blank screen when I launch M5Burner.app on MacOSX High Sierra 10.13.6.

Isn't M5Burner just a wrapper for some commands for esptool.py? Is there an equivalent command-line / shell-script for uploading scripts to M5Stack Core, Stick or Stick-C.

-chris

Good luck M5Stack team on Maker-Faire in San Mateo May 17-19, 2019!!!