Hello @grbica ,
Can you verify you are connecting to the device via the USB port? Does the device show up in device manager and in Online > Select Connection > config? In the select connection menu use the drop down to change the try selecting the device itself, you should see the serial number listed.
Make sure you are connected then remove power from the device then when you power it on start the upload.
Alternatively you can update the config though a serial terminal such as hyper terminal or putty. Below is a link with HyperTerminal along with instructions.
X-gateway and HyperTerminal.zip (453.7 KB)