Assume that you installed the Rust compiler on your computer.
cargo install cargo-espflash espflash ldproxy
Get a pre-compiled binary version of the firmware.
curl -LO https://echokit.dev/firmware/echokit-boards
To build the echokit-boards firmware file from source, you need to make sure that you install the OS-specific dependencies and then ESP toolchain for Rust. You can then build from the source and find the binary firmware in target/release/.
cargo build --release
You MUST connect the computer to the SLAVE USB port on the device. Allow the computer to accept connection from the device. The detected USB serial port must be JTAG. IT CANNOT be USB Single.
espflash flash --monitor --flash-size 16mb echokit-boards
The response is as follows.
[2025-04-28T16:51:43Z INFO ] Detected 2 serial ports
[2025-04-28T16:51:43Z INFO ] Ports which match a known common dev board are highlighted
[2025-04-28T16:51:43Z INFO ] Please select a port
✔ Remember this serial port for future use? · no
[2025-04-28T16:52:00Z INFO ] Serial port: '/dev/cu.usbmodem2101'
[2025-04-28T16:52:00Z INFO ] Connecting...
[2025-04-28T16:52:00Z INFO ] Using flash stub
Chip type: esp32s3 (revision v0.2)
Crystal frequency: 40 MHz
Flash size: 8MB
Features: WiFi, BLE
... ...
I (705) boot: Loaded app from partition at offset 0x10000
I (705) boot: Disabling RNG early entropy source...
I (716) cpu_start: Multicore app
Reset the device (simulate the RST button or power up).
espflash reset
Delete the existing firmware if needed.
espflash erase-flash
You will need to configure and start up an EchoKit server, and then configure your device to connect to the server in order for the EchoKit device to be fully functional.