Hello all
The iRobot Home app is constantly being adapted and improved. Now this problem has also been solved. In addition to cleaning and exclusion zones, thresholds can now also be drawn in the cleaning map. This helps the Braava jet m6 to manoeuvre over elevations in order to reach other areas of the home independently if necessary.
If you have any questions or queries, please do not hesitate to contact us directly. We can be reached by email at service@irobotics.ch and by phone at +41 62 746 06 74.
Best regards,
iRobot Team

If the height difference between the rooms is maximum 2 -3 mm, lower door thresholds, such as this Alfer Transition Profile can be used. At 4 mm thresholds, the Braava Jet m6 reaches its limits. Converting all the door thresholds to the Alfer transition profiles solved the problem for me.