I have been using the mirror setting at all times but i must have doe and rekordbox update/import without How do i keep mirror set permanantlt and how do i renove duplicates from the iphone - will i have to delete everything and start again?
thank you

The mirror mode defaults to off for safety because many users only import 1 or 2 playlists at a time so it could cause issues!

As for the mobile app - it should sync the changes automatically. If you're seeing duplicates, try either of these:

1. Settings/Cloud - Force Sync Check.
2. Or if that doesn't work, Settings/Reset Tools - Reset Local Library. After login it will sync correctly.