USB stick compatbel with 2000 nexus2

Hi

USB sticks created on RB 5 and playing on CDJ 3000, that's fine.

But now I have a USB stick formatted on FAT32 and files exported from RB 6.8.2.
Yesterday it couldn't be read on CDJ 2000 nexus2 players. On the screen it simply says "No USB".

I guess that's because RB 6 isn't compatible with 2000 players if files are exported from there?
How can you make that work?
I don't have RB 5 anymore, how can I create USB sticks on RB 6 that work with CDJ 2000's? 

Thank you