Flashing WLED Firmware
The ESP8266 and ESP32 microcontrollers can be easily re-flashed if you have a microUSB data cable. It needs to be a data cable and not simply a charging cable.
Once you have located one, there are three pieces of software that you will need.
1) CP210x VCP Driver – his allows your computer to recognize the ESP8266 when it is plugged in.
Windows: https://www.silabs.com/documents/public/software/CP210x_Windows_Drivers.zip
Mac: https://www.silabs.com/documents/public/software/Mac_OSX_VCP_Driver.zip
2) ESPHomeFlasher – this is the flashing utility
Windows: https://github.com/esphome/esphome-flasher/releases/download/1.4.0/ESPHome-Flasher-1.4.0-Windows-x64.exe
Mac: https://github.com/esphome/esphome-flasher/releases/download/1.4.0/ESPHome-Flasher-1.4.0-macOS.tar
3) WLED Firmware – I have customized versions available for the Duo2Go and Tetra2Go:
https://drive.google.com/drive/folders/1XVffFzPUyI6bxxVbd-8a5q2whyF9Xca7?usp=drive_link
Download and install #1 and #2
Download #3 and remember where you saved it.
Next, while making sure that NO POWER CABLE is attached into the Duo/Tetra, connect the MicroUSB cable into the ESP8266/ESP32 and plug the other end into your computer’s free USB port.
You should hear a notification sound from Windows, denoting that the device is installed.
If the ESP8266/ESP32 is installed properly, you should see an item under the “Serial Port” dropdown that looks like “COM#”. There should be only one - select it.
Under “Firmware”, browse to the bin file that you downloaded above.
Then – click the “Flash ESP” button. The blue light on the ESP8266/ESP32 should go out while it is flashing. When the output gets to 100% (you can disregard the garbage text that happens after this), the blue light will come back on. You can safely unplug the MicroUSB cable from the ESP8266/ESP32 and re-attach power to the Duo.
When it powers back up it should be a fresh install, just like it was when you first received it.