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Days of trying to install micropython on the Faces Kit I bought on Amazon. The solution I used is this. On my Mac;
M5Burner; erase device.
Go to https://github.com/m5stack/FACES-Firmware/
Download the master.zip Unzip. Find m5stack-micropython-tft-repl-v1.0.bin
On the Mac goto Applications, right click M5burner App, "Show Package Contents"
Navigate to the /FW/ directory, in resources, I believe.
Copy the file UIFlow-v1.7.1-en.bin to a safe place.
Copy the m5stack-micropython-tft-repl-v1.0.bin to this directory.
Rename the file m5stack-micropython-tft-repl-v1.0.bin to UIFlow-v1.7.1-en.bin
M5burner, burn the UIFLOW(CORE).
Micropython REPL should now work with the Faces keyboard and LCD.
I never could get Esptool to erase or flash directly on the M5stack. I wasted many hours trying. I have successfully used esptool on all of my ESP8266 and ESP32's.