Flash Dash

Before you start: This tool needs Chrome or Edge (Web Serial support). Mobile browsers can't do the USB flashing part (no Web Serial on phones, ever - not a bug, a browser limitation) - use a laptop/desktop for that. From a phone, use the WiFi Update section further down the Updating tab instead: it can flash firmware AND push gauge configs, both over WiFi, once a board is in update mode.

Flash Dash — a local tool, nothing here is uploaded anywhere. Firmware/config library is stored in this browser only (IndexedDB) — use Export to back it up or share it. USB flashing uses esptool-js via Web Serial.