As @https://www.ifixit.com/User/3081968/Mich... pointed out this is one or more motor connection issues. As per https://www.ifixit.com/User/3695100/swiv... from flight app view, we can find which motor is not connected as it’s red. For me even though how hard I pushed the connector it did not work properly. The connector was loose. (even though I connected a different motor it did not detect by the motherboard.) I used my multimeter ohms scale which has around 1 Ohm per each of 3 pins. I removed the motor connector and sold it directly to the motherboard :). Did the trick for me and saved some money and time as well.