Flash a Citizen badge

Board: ESP32-2424S012C (ESP32-C3, 1.28" round). Use Chrome or Edge on desktop. Plug the badge in with a USB-C data cable, then press the button and pick the serial port.

This browser cannot flash. Use desktop Chrome or Edge. Flashing needs a secure (https) page.

If the port does not show up, hold BOOT on the back while plugging in.

After flashing: hold BOOT for 2 seconds after the screen lights up to set WiFi from your phone.