XDJ-RX Firmware reïnstall

Hello,

I recently had a audio drop out on the right deck of my RX, during recording of my set. I was wondering how this could have happened and my first thing to check was the firmware.

The firmware was already updated to the latest version when I got hold of the unit, but I'd like to "reïnstall" or overwrite the firmware with the same version, so I have a clean and fresh firmware. 

Is this possible in any way? I tried the normal update proceger but the update proces won't start on my RX version 2.20.

Thanks in advance,

Serge