I am working on Video Calibrating ESCs. I managed to calibrate the motors with black top. When I try the motors with silver top the motors just shake or stammer but do not speed up like the other two.
When I detached the motors from the frame and tried to calibrate unattached both silver top motors work fine. I am using the Dojo Drone kit.
Another thing you may look into @AliMuhammad is the bullet connectors on the motors.
If they are just jittering back and forth, this 99% of the time means there is residue on the bullet connectors of the motors, creating unnecessary resistance.
You can start out rotating the male bullet connectors in a circle when they are plugged into the ESCs. This will sometimes scrape off residue.
If this doesn’t work, you may need to take a small pliers, gently grab one of the 3 motor bullet connectors and rotate it in a circle. You will see a white residue come off. Do this for several rotations and on each bullet connector. Then try to power it again. Doing this a couple times should remove jittering behavior of the motors.
Having a like issue. New build, new components…don’t suspect any corrosion on bullets and, without de-soldering the ESC and connecting it to the next motor over, the issue follows the ESC. New ESC bad (probably, it’s Chinese)? Didn’t calibrate correctly maybe?