I am facing the same thing everything looks good with the plus but she just flips now if i ramp up slow and watch the grass it looks like the left side props ramp up a lot faster than the right and just flips the unit over. I have found very little info on recalibrating the esc and the procedure i have found is for iris and not iris plus if that makes a diff , i get to the point where its supposed to make a long buzz or tone after the second battery connect but it just sits with the lights on...very frustrating.