[123WerefromJCC]

Hello,

We are relatively new to drone building.  We are using a CC3d flight controller with HobbyKing 30 A ESCs.  They are PWM 490 Hz.  We were able to calibrate two of them using LibrePilot GCS Wizard, however two ESCs are still out of sync.   We have tried using the Vehicle Setup Wizard, tried manual calibration, and using our TX.  When doing manual calibration, we get startup beep sequence from our ESCs, but no additional calibration beeps.  Any suggestions?

[TheOtherCliff]

Do the two bad ESCs work?  Do they sound the same during power on?

I suggest you re-run the wiki ESC calibration with higher or lower max: Instead of 1900 try 2000, 2050 or 1850.