I wish I could help. I’m having very similar issues, however, mine will say “failed “ but never shows me the calibration graph so I can get it calibrated correctly. I’ve had a ticket with Garmin for a month. Sent them videos of the process and they haven’t offered any solutions. So frustrating. Big question is do you see the calibration graph when calibrating?? Wishing I had spent a little more money and bought something else.