Lumen

Install Lumen firmware on a board over USB, from Chrome or Edge on a computer.

1. Your board

Unexpected Maker FeatherS3 [D]16 MB flash. The default board. Espressif ESP32-S3-DevKitC-1 N16R816 MB flash. A bench board. Adafruit Feather ESP32-S3 (4 MB flash, 2 MB PSRAM)Replaces its UF2 bootloader.

2. Channel

StableTagged releases. BetaRebuilt on every change to dev.

3. Install

Connect the board by USB. If it is not found, hold BOOT while you plug it in.
Press Install and pick its port. On a first install, choose to erase the device.
When it restarts, join the Setup-Me WiFi network and open http://192.168.4.1 to set it up.

An update over USB keeps the saved settings unless you erase. A device already set up can also update itself from its Info tab.