I tried to calibrate my newly purchased AFR500V2 from Ballenger today. It counts down from 18 to 14 and then restarts the boot-up process. Don't know if I'm doing something wrong or if my unit is defective. I tried disconnecting and reconnecting battery power 3 times, and it did the same thing every time.
https://www.youtube.com/watch?v=NHy2fcqm4Q8