The PSX (Playstation 1 & 2) firmware does not use USB for connection to the console. It requires special wiring.
After programming KADE as a PSX encoder you will not need to use the USB plug.
A PSX controller cable should be wired to 7 inputs on the KADE (including ground and +V) as per the following image.
You can connect the KADE to USB again whenever you need to change the programming.
Please ensure that the connector is unplugged from your Playstation before attempting to reprogram.
If you run into trouble, please post your questions here: