As CD Players become much more mini-computers with all their features and gadgets it can happen that it's firmware needs updating. This is a very easy process on the Pioneer CDJ-series.
Here is a short clip (just over 1 minute) that shows how this 2-step process is done. The buttons you need to press vary from CDJ to CDJ, this clip is for the Pioneer CDJ-800MK2 only !
This video was made by Lead for www.djresource.eu but also appears for Pioneer ProDJ's own website : DJsounds.com
You should check and download the latest version from PioneerProDJ.eu
Demonstration: Lead
Camera: Lead
Editing: Lead
Watch this video on Youtube, it's better quality :