What is EasyLoader?
SD-UPdater for M5StickC is below.

matsumo / M5StickC-SD-Updater
https://github.com/matsumo/M5StickC-SD-Updater

I had also a closer look at the PCB and recognized a "missing" component near the RESET button:

The part is C44 100nF.
Removed on M5Stack Fire to prevent Nois.

See below.
Parts arrangement of M5Stack
https://macsbug.wordpress.com/2020/04/01/parts-arrangement-of-m5stack/

8. GPIO23 Radiation, Audio Amp
   Audio Amp：
   _ 2. C44 to U9-4: BASIC and GRAY are connected. FIRE is not connected.
   FIRE: Noise is reduced by removing C44 from U9-4.

The MAX40200 is a great idea.

1. I want a power switch for M5Stack 700mA BATTERY MODULE.
2. I have switched on the Battery side.
   Example 1: AA, AAA battery adapter for M5Stack.
   https://macsbug.wordpress.com/2019/04/30/aa-aaa-battery-adapter-for-m5stack/
   Example 2: M5STACK Strongest 2400 mAh Battery Module
   https://macsbug.wordpress.com/2018/08/20/m5stack-strongest-2400-mah-battery-module/
   Example 3: Low price Battery Module of M5STACK
   https://macsbug.wordpress.com/2018/06/23/low-price-battery-module-of-m5stack/

The following information may be helpful.

1. Cannot write to M5StickC on macOS Catalina :
   https://qiita.com/SamAkada/items/fa32d6072a832a10cd84

2. How to solve the problem that M5StickC can not be written with Arduino IDE of macOS Catalina :
   https://tech.fusic.co.jp/posts/2020-02-12-macos-catalina-m5stickc/

There is a way to attach a diode to the Battery Module.
Blog：USB Cable and Reset prevention
https://macsbug.wordpress.com/2020/04/07/usb-cable-and-reset-prevention/

Below are examples of M5StickC and IR.
https://qiita.com/poruruba/items/34220a4dd6aaf48392aa
https://lang-ship.com/blog/?p=886
https://lab.sasapea.mydns.jp/2019/06/28/m5stickc-ir/
https://note.com/ssktkr/n/ne9f289509bea

@nikza5566

Level converter is required for connection.

1. resistor to connect
   Meter PZEM-004T with Arduino ESP32 ESP8266 Python & Raspberry Pi
   Modification TTL UART from 5v to 3.3v
   http://pdacontrolen.com/meter-pzem-004t-with-arduino-esp32-esp8266-python-raspberry-pi/

2. level converter to connect
   Measuring home energy consumption with the PZEM004T and ESP8266
   https://primalcortex.wordpress.com/tag/pzem004t/

There is a similar question below.
http://forum.m5stack.com/topic/1454/m5stick-oled-cant-turn-on