Sharing Naza-M Assistant Software Error Code List here so that you can get a good knowledge of the errors and how to fix it! CFG-ERR Configuration error, this may cause by firmware upgrade from old version. or abnormal Tx calibration. Re-calibrate your transmitter, and power cycle your controller and check all of the parameters. VOL-LOW  Voltage low SN-ERR Your S/N is not available, Please contact our support! VOL-LOW Voltage low IMU-ERR IMU ERROR,Please contact dealer or DJI for repair. X1-ERR You’ve chose parameters tuning by X1/X2 channel with Tx Knob, but no signal detected on X1/X2 input channel, or Tx didn’t powered on. X2-ERR You’ve chose parameters tuning by X1/X2 channel with Tx Knob, but no signal detected on X1/X2 input channel, or Tx didn’t powered on. PMU-ERR Please check the connection among battery, MC and PMU. RX-ERR Please may sure you select the right receiver type in the RC page or check the receiver connection, after that power cycle your controller to take effect. COMPASS-ERR Compass data is abnormal, please restart your Controller, if you still get this error, please contact the agent. ERROR  IMU initialization failure, may caused by crash. Please contact dealer or DJI for repair. ERROR  Please perform Advanced Calibration. ERROR  GPS not calibrated, or magnetic field interference. Please calibrate GPS again in good condition.