If I connect the keyboard/mouse on CS533 to control the Bluetooth device, but there is compatible issue with keyboard/mouse.  I have upgraded the firmware but it does not work, How can I do it? 

The normal connection is like the video in YouTube as the link below.

 https://www.youtube.com/watch?v=iUEICZeQ7Xg

The other way is to connect keyboard/mouse on PC and, use the software to link to CS533 to do the Bluetooth control.

Because the keyboard/mouse directly connect the PC, the compatible issue could be reduced.