diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 1af457773..5cad11fff 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -1946,7 +1946,7 @@ int MachineObject::command_start_calibration(bool vibration, bool bed_leveling,
     }
 }
 
-int MachineObject::command_start_pa_calibration(const X1CCalibInfos &pa_data, bool is_manual)
+int MachineObject::command_start_pa_calibration(const X1CCalibInfos &pa_data, int mode)
 {
     pa_calib_results.clear();
     if ((printer_type == "BL-P001" || printer_type == "BL-P002")) {
@@ -1954,7 +1954,7 @@ int MachineObject::command_start_pa_calibration(const X1CCalibInfos &pa_data, bo
         j["print"]["command"]     = "extrusion_cali";
         j["print"]["sequence_id"] = std::to_string(MachineObject::m_sequence_id++);
         j["print"]["nozzle_diameter"] = to_string_nozzle_diameter(pa_data.calib_datas[0].nozzle_diameter);
-        j["print"]["manual"]          = is_manual;
+        j["print"]["mode"]          = mode;
 
         for (int i = 0; i < pa_data.calib_datas.size(); ++i) {
             j["print"]["filaments"][i]["tray_id"]              = pa_data.calib_datas[i].tray_id;
@@ -3914,7 +3914,8 @@ int MachineObject::parse_json(std::string payload)
                                 else if ((*it)["n_coef"].is_string())
                                     pa_calib_result.n_coef = stof((*it)["n_coef"].get<std::string>().c_str());
 
-                                pa_calib_result.confidence = (*it)["confidence"].get<int>();
+                                if ((*it).contains("confidence"))
+                                    pa_calib_result.confidence = (*it)["confidence"].get<int>();
 
                                 pa_calib_results.push_back(pa_calib_result);
                             }
diff --git a/src/slic3r/GUI/DeviceManager.hpp b/src/slic3r/GUI/DeviceManager.hpp
index 03e8ee727..fd1c2008e 100644
--- a/src/slic3r/GUI/DeviceManager.hpp
+++ b/src/slic3r/GUI/DeviceManager.hpp
@@ -338,7 +338,7 @@ public:
     std::string name;
     float       k_value;
     float       n_coef;
-    int         confidence;
+    int         confidence = -1;
 };
 
 struct PACalibIndexInfo
@@ -827,7 +827,7 @@ public:
     int command_start_calibration(bool vibration, bool bed_leveling, bool xcam_cali);
 
     // PA calibration
-    int command_start_pa_calibration(const X1CCalibInfos& pa_data, bool is_manual = false);
+    int command_start_pa_calibration(const X1CCalibInfos& pa_data, int mode = 0);  // 0: automatic mode; 1: manual mode. default: automatic mode
     int command_set_pa_calibration(const std::vector<PACalibResult>& pa_calib_values);
     int command_delete_pa_calibration(const PACalibIndexInfo& pa_calib);
     int command_get_pa_calibration_tab(float nozzle_diameter, const std::string &filament_id = "");
diff --git a/src/slic3r/Utils/CalibUtils.cpp b/src/slic3r/Utils/CalibUtils.cpp
index bba89cd26..22eca1ac9 100644
--- a/src/slic3r/Utils/CalibUtils.cpp
+++ b/src/slic3r/Utils/CalibUtils.cpp
@@ -92,7 +92,7 @@ CalibMode CalibUtils::get_calib_mode_by_name(const std::string &name)
     return CalibMode::Calib_None;
 }
 
-void CalibUtils::calib_PA(const X1CCalibInfos &calib_infos, std::string &error_message, bool is_manual)
+void CalibUtils::calib_PA(const X1CCalibInfos &calib_infos, std::string &error_message, int mode)
 {
     DeviceManager *dev = Slic3r::GUI::wxGetApp().getDeviceManager();
     if (!dev)
@@ -103,7 +103,7 @@ void CalibUtils::calib_PA(const X1CCalibInfos &calib_infos, std::string &error_m
         return;
 
     if (calib_infos.calib_datas.size() > 0)
-        obj_->command_start_pa_calibration(calib_infos, is_manual);
+        obj_->command_start_pa_calibration(calib_infos, mode);
 }
 
 void CalibUtils::emit_get_PA_calib_results(float nozzle_diameter)
diff --git a/src/slic3r/Utils/CalibUtils.hpp b/src/slic3r/Utils/CalibUtils.hpp
index a7679fc4b..b49432fd9 100644
--- a/src/slic3r/Utils/CalibUtils.hpp
+++ b/src/slic3r/Utils/CalibUtils.hpp
@@ -30,7 +30,7 @@ public:
 
     static CalibMode get_calib_mode_by_name(const std::string &name);
 
-    static void calib_PA(const X1CCalibInfos &calib_infos, std::string &error_message, bool is_manual = false);
+    static void calib_PA(const X1CCalibInfos &calib_infos, std::string &error_message, int mode = 0); // 0: automatic mode; 1: manual mode. default: automatic mode
     
     static void emit_get_PA_calib_results(float nozzle_diameter);
     static bool get_PA_calib_results(std::vector<PACalibResult> &pa_calib_results);