Firmware flashing

Flash FKMTime firmware to your device directly from the browser using esp-web-tools. Neither drivers nor CLI tools are required!

Requirements

• A Chromium-based browser (Chrome, Edge or Opera) on desktop.
• The page must be served over HTTPS (the public docs site is - Web Serial will not work over plain HTTP, except on localhost).
• A USB cable that supports data (not just power) and the device set to bootloader/download mode if required.

The latest firmware for each hardware revision is shown first. Use the Show older versions button to access previous releases.

Loading flasher…

Troubleshooting

• "Web Serial not supported" - switch to Chrome, Edge or Opera on a desktop OS.
• Device not detected - try another USB cable / port, and make sure no other program (serial monitor, IDE) is holding the port open.
• Flash fails partway through - perform a full chip erase by re-running the flasher; the installer offers an erase option on first install.

If problems persist, see the debugging section or open an issue on GitHub.