Failed to connect over Serial.
Are you sure your Teensy is connected and the M8 Headless firmware is loaded?
Make sure that there are no other programs running which may have the serial port open.
On Linux you may also need make sure you have permission to open the serial port (eg. make yourself a member of the dialout group).
It is also possible there's a bug in this code.
There may be some messages in the developer console that will help with debugging.
Failed to connect with WebUSB.
Are you sure your Teensy is connected and the M8 Headless firmware is loaded?
Connecting with WebUSB is known not to work on Windows, Linux and some Samsung phones.
Please make sure you are using an up to date version of Chrome or Edge (89+).
Your browser doesn't appear to have Serial or WebUSB support.
These are only currently supported in Chrome and some Chrome-derived browsers.
M8 Display
A light fork of derkyjadex's M8WebDisplay with support for YouTube, video file, and camera backgrounds with audio-reactive effects.
Use the menu to load a background, then open Reactivity to dial in shake, skew, hue shift, blur, and more driven by your M8's audio output. Press I to invert the background on the fly.
All settings and your video library are stored locally by your browser.
Build 2026-03-19T06:30:15 9fbf5a3
SETTINGS
Select a firmware file
Loading file...
The selected file does not appear to be a valid Teensy 4.1 firmware file
Connect your Teensy board and press the little button on the board
The selected device does not appear to be a Teensy 4.1
Ready to flash
Flashing...
There was an error flashing the device. You can try again.