Looks like rtc is included in one of the other files

from m5stack import *
from m5ui import *
from uiflow import *

setScreenColor(0x111111)

rtc.setTime(0, 0, 0, 0, 0, 0)

@jackh
1 & 2

Hi, I just ran some test and the LED doesn't work if the lithium battery in the base is below 3.8 volts. the microprocessor wont start up and so the M5StickC can't communicate.

When devices start up, go to setting and set connection mode to USB. Default is set to Wifi/usb.

UIFlow is built on a version of MP 1.12 as so micropython can be accessed directly over the USB.
However because it is based on MP1.12 so of the modules not required by UIFlow may have been removed.
Any IDE that can access MP over USB can be used to program M5Stack cores and sticks.

Core Ink runs on both battery and USB.

M3 X 10mm.

The demo programs can be found in M5Burner so you can easily erase and install firmware and programs.

The SPK Hat appears under C-Hat not hardware.

@donnyb Download and Use M5Burner as it has a button to erase the flash.