HP LaserJet Enterprise flow M830 Multifunction Printer series - Manual (Page 129)

Clear jams in the duplexer
1. Pull the release handle on the top of the finishing
accessory, and then slide the finisher away from
the product until it stops.
2. Open the left door.
3. Lift the jam access cover on the duplexer.
ENWW Clear jams 119