Move collection from 6 to 5 .

The libraries aren't compatible, so you can't load your v6 library in v5.

Your only option would be to add the tracks in v5, analyse, set cue points etc manually. 

as good as their hardware is , as bad is their software .

i think those devs from pioneer playing fortnite all day .

pioneer really need to hire some good devs cause now they dont have any good devs .

if i was the CEO of pioneer i would be furious that my devs make such bad software as rb6 and  fire the whole dev team and hire some capable guy's to do this .

@Gary Moens

That's obviously your opinion... and only as valid as one person's opinion can be.

But it's very common for major versions of new software to include a database upgrade - which is irreversible. The release notes clearly state this and suggest that users review v6 for suitability and bear in mind the above if they want to revert to a previous version.