Try BSR 1. I have a 440 and only one of the BSR settings works--don't know why--just is.
Manual:
BERNINA aurora 440 QE Support BERNINA
Check to make sure the BSR is firmly plugged into the machine head. Don't know why they made this so difficult. I find I usually have to practically stand on my head to find it and then plug it in.
If it still does not work, perhaps Bernina did not calibrate the BSR to your machine. They recommend, whenever it goes for service, to be sure to bring the buttonhole foot and BSR so they can be calibrated.
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