Over WiFi
The clock can request the available release list from this site. Choose a build on the clock and it downloads that release's OTA image, verifies the checksum, and installs it to the spare partition.
Firmware
Choose the firmware for your clock.
Browse available builds below. Download an OTA image for WiFi installation, or connect your clock by USB when a merged image is available.
Firmware releases
No releases published
Check back later for available clock firmware.
USB flashing
Flash a selected release over USB.
Choose a release above and use its USB action. USB flashing needs Chrome, Edge or Opera on a computer over HTTPS; clocks can install the OTA image over WiFi.
Choose a build
Install by WiFi or USB.
From the clock
Open Settings → Firmware to view available builds and select the one to install.
From its web page
Download an OTA image here, or use the USB flasher beside a release when that build includes a merged image.
If something goes wrong
An interrupted download cannot damage the clock. New firmware is written to a spare slot and only becomes the version that runs once the whole image has arrived and its checksum matches. A dropped WiFi connection or a power cut part-way through just means the clock starts on the firmware it already had and tries again later.
If your clock reports No OTA partition, it was flashed with a layout that has no room for a second copy of the firmware. Download an OTA-capable release and flash its merged USB image once; OTA installation needs a spare firmware partition.
Anything else — get in touch.