Download .zip with firmware and .hex uploader:
Disconnect Quadruple from DC power and connect it to your Windows PC using micro-USB data cable.
Open HexUploader.exe from the .zip file above.
![](https://kgmidicontrollers.com/wp-content/uploads/2023/04/CleanShot-2023-04-18-at-13.10.54@2x.png)
![](https://kgmidicontrollers.com/wp-content/uploads/2023/04/CleanShot-2023-04-18-at-13.10.39@2x-300x255.png)
Select .hex firmware file to upload and select Serial COM port, press Upload Hex.
![](https://kgmidicontrollers.com/wp-content/uploads/2023/04/CleanShot-2023-04-18-at-13.14.43@2x-1024x522.png)
![](https://kgmidicontrollers.com/wp-content/uploads/2023/04/CleanShot-2023-04-18-at-13.15.31@2x-1-300x295.png)
Perform “factory reset” after flashing (A+D hold on boot). Check Quadruple I/O manual