I just changed motors and propellers of my hex to lower kv and bigger diameter. I updated ESC32 firmware to latest official version (http://autoquad.org/software-downloads/?did=78) and ran the calibration as usual with qGroundControl v1.3 RC1. I left ESC32 to its default settings before calibrations.
After first calibration run (rpm to voltage) FF1TERM and FF2TERM said both "NaN". Not a number? I found it odd but couldn't remember if this was the case with my previous calibration runs with the previous motors and props, too.
After second calibration run (current limiter) FF1TERM and FF2TERM said both "0". I started comparing them to old calibration files and found out they had always had some value before. Why not now?
I noticed after upgrading firmware of all the ESC32's that I had forgot to adjust the motor poles count from default 14 to 28 that is actually is. So, I have to run the calibration again. But is there some explanation or a reason why FF1 and FF2TERMs were left 0 after the calibrations?
I'll report back if they are still 0 after second attempt.