Flash Firmware

Flash ESPHome or HomeKit-compatible firmware to your device directly from the browser using a USB cable. No software installation needed.

1. Select Your Platform

Supported Boards

M5Stack Atom S3 Lite (ESP32-S3)
M5Stack NanoC6 (ESP32-C6)

The correct firmware is selected automatically based on your connected device. Don't have a board yet? See what you need.

2. Flash

Instructions

Connect your device to your computer via USB-C.
Click Install Firmware below and select the serial port.
Wait for flashing to complete, then reset the device.

Your browser does not support Web Serial. Use Chrome or Edge.

This installs a curated ESPHome configuration built on echavet's MitsubishiCN105ESPHome component, with basic climate control, web server, and OTA support. For a custom configuration with remote sensors, vane control, or diagnostics, use the YAML generator after initial setup.

After flashing: The flasher will prompt you to configure WiFi — enter your network credentials to connect the device wirelessly before unplugging USB.

This installs the HomeKit-compatible firmware. After flashing, the device creates a WiFi access point for setup.

Next Steps

Continue to HomeKit-Compatible Setup

Notes

Requires a Chromium-based browser (Chrome, Edge, Brave) with Web Serial support.
Use a USB data cable, not a charge-only cable.
If your device isn't detected, you may need to install USB drivers.
Having trouble? See the troubleshooting guide.