diff --git a/companion/src/firmwares/boards.cpp b/companion/src/firmwares/boards.cpp
index 512dd6e7003..24c31279b9b 100644
--- a/companion/src/firmwares/boards.cpp
+++ b/companion/src/firmwares/boards.cpp
@@ -22,10 +22,10 @@
 #include "boards.h"
 #include "macros.h"
 #include "compounditemmodels.h"
-#include "moduledata.h"
 #include "helpers.h"
 #include "boardfactories.h"
 #include "generalsettings.h"
+#include "modeldata.h"
 
 // TODO remove all those constants
 // Update: These are now all only used within this class.
@@ -330,7 +330,7 @@ int Boards::getCapability(Board::Type board, Board::Capability capability)
 
     case FunctionSwitchGroups:
       if (getCapability(board, FunctionSwitches)) {
-        return IS_RADIOMASTER_GX12(board) ? 4 : 3;
+        return IS_RADIOMASTER_GX12(board) ? CPN_MAX_CUSTOMSWITCH_GROUPS : 3;
       }
       return 0;
 
diff --git a/companion/src/firmwares/customisation_data.cpp b/companion/src/firmwares/customisation_data.cpp
index 14df45739d6..deda4a21cb9 100644
--- a/companion/src/firmwares/customisation_data.cpp
+++ b/companion/src/firmwares/customisation_data.cpp
@@ -29,12 +29,28 @@
 
 ZoneOptionValue::ZoneOptionValue()
 {
-  unsignedValue = 0;
-  signedValue = 0;
-  boolValue = 0;
-  stringValue.clear();
-  sourceValue.clear();
-  colorValue = 0;
+  clear();
+}
+
+ZoneOptionValue::ZoneOptionValue(const ZoneOptionValue & src)
+{
+  copy(src);
+}
+
+ZoneOptionValue & ZoneOptionValue::operator=(const ZoneOptionValue & src)
+{
+  copy(src);
+  return *this;
+}
+
+void ZoneOptionValue::copy(const ZoneOptionValue & src)
+{
+  unsignedValue = src.unsignedValue;
+  signedValue = src.signedValue;
+  boolValue = src.boolValue;
+  stringValue = src.stringValue;
+  sourceValue = src.sourceValue;
+  colorValue = src.colorValue;
 }
 
 bool ZoneOptionValue::isEmpty() const
@@ -43,9 +59,14 @@ bool ZoneOptionValue::isEmpty() const
          stringValue.empty() && sourceValue.toValue() == 0;
 }
 
-ZoneOptionValueTyped::ZoneOptionValueTyped()
+void ZoneOptionValue::clear()
 {
-  type = ZOV_Unsigned;
+  unsignedValue = 0;
+  signedValue = 0;
+  boolValue = 0;
+  stringValue.clear();
+  sourceValue.clear();
+  colorValue = 0;
 }
 
 inline void setZoneOptionValue(ZoneOptionValue& zov, bool value)
@@ -107,31 +128,108 @@ inline const char * zoneOptionValueEnumToString(ZoneOptionValueEnum zovenum) {
   }
 }
 
-static const ZoneOptionValueTyped zero_widget_option = {};
+ZoneOptionValueTyped::ZoneOptionValueTyped()
+{
+  clear();
+}
 
 bool ZoneOptionValueTyped::isEmpty() const
 {
   return type == ZOV_Unsigned && value.isEmpty();
 }
 
+void ZoneOptionValueTyped::clear()
+{
+  type = ZOV_Unsigned;
+  value.clear();
+}
+
+void WidgetPersistentData::clear()
+{
+  for (int i = 0; i < MAX_WIDGET_OPTIONS; i += 1)
+    options[i].clear();
+}
+
+ZonePersistentData::ZonePersistentData(const ZonePersistentData & src)
+{
+  copy(src);
+}
+
+ZonePersistentData & ZonePersistentData::operator=(const ZonePersistentData & src)
+{
+  copy(src);
+  return *this;
+}
+
+void ZonePersistentData::copy(const ZonePersistentData & src)
+{
+  widgetName = src.widgetName;
+  widgetData = src.widgetData;
+}
+
 bool ZonePersistentData::isEmpty() const
 {
   return widgetName.empty();
 }
 
+void ZonePersistentData::clear()
+{
+  widgetName.clear();
+  widgetData.clear();
+}
+
+RadioLayout::CustomScreenData::CustomScreenData(const RadioLayout::CustomScreenData & src)
+{
+  copy(src);
+}
+
+RadioLayout::CustomScreenData & RadioLayout::CustomScreenData::operator=(const RadioLayout::CustomScreenData & src)
+{
+  copy(src);
+  return *this;
+}
+
+void RadioLayout::CustomScreenData::copy(const RadioLayout::CustomScreenData & src)
+{
+  layoutId = src.layoutId;
+  layoutPersistentData = src.layoutPersistentData;
+}
+
 bool RadioLayout::CustomScreenData::isEmpty() const
 {
   return layoutId.empty();
 }
 
+void RadioLayout::CustomScreenData::clear()
+{
+  layoutId.clear();
+  layoutPersistentData.clear();
+}
+
+RadioLayout::CustomScreens::CustomScreens(const RadioLayout::CustomScreens & src)
+{
+  copy(src);
+}
+
+RadioLayout::CustomScreens & RadioLayout::CustomScreens::operator=(const RadioLayout::CustomScreens & src)
+{
+  copy(src);
+  return *this;
+}
+
+void RadioLayout::CustomScreens::copy(const RadioLayout::CustomScreens & src)
+{
+  for (int i = 0; i < MAX_CUSTOM_SCREENS; i++)
+    customScreenData[i] = src.customScreenData[i];
+}
+
 void RadioLayout::CustomScreens::clear()
 {
-  for (int i = 0; i < MAX_CUSTOM_SCREENS; i++) {
-    customScreenData[i] = CustomScreenData();
-  }
+  for (int i = 0; i < MAX_CUSTOM_SCREENS; i++)
+    customScreenData[i].clear();
 }
 
-void RadioLayout::init(const char* layoutId, CustomScreens& customScreens)
+void RadioLayout::init(const std::string layoutId, CustomScreens& customScreens)
 {
   customScreens.clear();
 
diff --git a/companion/src/firmwares/customisation_data.h b/companion/src/firmwares/customisation_data.h
index f26b4321e57..2d01653b488 100644
--- a/companion/src/firmwares/customisation_data.h
+++ b/companion/src/firmwares/customisation_data.h
@@ -60,6 +60,11 @@ struct ZoneOptionValue  // union in radio/src/datastructs.h
   unsigned int colorValue;
 
   ZoneOptionValue();
+  ZoneOptionValue(const ZoneOptionValue & src);
+  ZoneOptionValue & operator=(const ZoneOptionValue & src);
+
+  void clear();
+  void copy(const ZoneOptionValue & src);
   bool isEmpty() const;
 };
 
@@ -111,6 +116,7 @@ struct ZoneOptionValueTyped
   ZoneOptionValue     value;
 
   ZoneOptionValueTyped();
+  void clear();
   bool isEmpty() const;
 };
 
@@ -118,6 +124,7 @@ struct WidgetPersistentData {
   ZoneOptionValueTyped options[MAX_WIDGET_OPTIONS];
 
   WidgetPersistentData() {}
+  void clear();
 };
 
 struct ZonePersistentData {
@@ -125,6 +132,10 @@ struct ZonePersistentData {
   WidgetPersistentData widgetData;
 
   ZonePersistentData() {}
+  ZonePersistentData(const ZonePersistentData & src);
+  ZonePersistentData & operator=(const ZonePersistentData & src);
+  void clear();
+  void copy(const ZonePersistentData & src);
   bool isEmpty() const;
 };
 
@@ -134,6 +145,14 @@ struct WidgetsContainerPersistentData {
   ZoneOptionValueTyped options[O];
 
   WidgetsContainerPersistentData() {}
+  void clear() {
+    for (int i = 0; i < N; i++) {
+      zones[i].clear();
+    }
+    for (int i = 0; i < O; i++) {
+      options[i].clear();
+    }
+  }
 };
 
 typedef WidgetsContainerPersistentData<MAX_LAYOUT_ZONES, MAX_LAYOUT_OPTIONS>
@@ -152,14 +171,24 @@ class RadioLayout
       LayoutPersistentData layoutPersistentData;
 
       CustomScreenData() {}
+      CustomScreenData(const CustomScreenData & src);
+      CustomScreenData & operator=(const CustomScreenData & src);
+
+      void clear();
+      void copy(const CustomScreenData & src);
       bool isEmpty() const;
     };
 
     struct CustomScreens {
       CustomScreenData customScreenData[MAX_CUSTOM_SCREENS];
 
+      CustomScreens() {}
+      CustomScreens(const CustomScreens & src);
+      CustomScreens & operator=(const CustomScreens & src);
+
       void clear();
+      void copy(const CustomScreens & src);
     };
 
-    static void init(const char * layoutId, CustomScreens & customScreens);
+    static void init(const std::string layoutId, CustomScreens & customScreens);
 };
diff --git a/companion/src/firmwares/edgetx/yaml_modeldata.cpp b/companion/src/firmwares/edgetx/yaml_modeldata.cpp
index 07129cb1e8e..c1db7a7b423 100644
--- a/companion/src/firmwares/edgetx/yaml_modeldata.cpp
+++ b/companion/src/firmwares/edgetx/yaml_modeldata.cpp
@@ -984,12 +984,12 @@ struct convert<FrSkyScreenData> {
 };
 
 template <>
-struct convert<customSwitch> {
-  static Node encode(const customSwitch& rhs);
-  static bool decode(const Node& node, customSwitch& rhs);
+struct convert<CustomSwitchData> {
+  static Node encode(const CustomSwitchData& rhs);
+  static bool decode(const Node& node, CustomSwitchData& rhs);
 };
 
-Node convert<customSwitch>::encode(const customSwitch& rhs)
+Node convert<CustomSwitchData>::encode(const CustomSwitchData& rhs)
 {
   Node node;
   node["type"] = cfsSwitchConfig << rhs.type;
@@ -1006,7 +1006,7 @@ Node convert<customSwitch>::encode(const customSwitch& rhs)
   return node;
 }
 
-bool convert<customSwitch>::decode(const Node& node, customSwitch& rhs)
+bool convert<CustomSwitchData>::decode(const Node& node, CustomSwitchData& rhs)
 {
   if (!node.IsMap()) return false;
 
@@ -1254,7 +1254,7 @@ Node convert<ModelData>::encode(const ModelData& rhs)
     if (topbarData && topbarData.IsMap()) {
       node["topbarData"] = topbarData;
     }
-    for (int i = 0; i < MAX_TOPBAR_ZONES; i += 1)
+    for (int i = 0; i < MAX_TOPBAR_ZONES; i++)
       if (rhs.topbarWidgetWidth[i] > 0)
         node["topbarWidgetWidth"][std::to_string(i)]["val"] = (int)rhs.topbarWidgetWidth[i];
     node["view"] = rhs.view;
@@ -1265,14 +1265,17 @@ Node convert<ModelData>::encode(const ModelData& rhs)
 
   int funcSwCnt = Boards::getCapability(board, Board::FunctionSwitches);
   if (funcSwCnt) {
-    for (int i = 0; i < funcSwCnt; i += 1) {
+    for (int i = 0; i < funcSwCnt; i++) {
       int sw = Boards::getSwitchIndexForCFS(i);
       std::string tag = Boards::getSwitchYamlName(sw, BoardJson::YLT_CONFIG).toStdString();
       node["customSwitches"][tag] = rhs.customSwitches[i];
     }
 
-    for (int i = 1; i < 4; i += 1) {
-      node["cfsGroupOn"][std::to_string(i)]["v"] = rhs.cfsGroupOn[i];
+    int funcSwGrps = Boards::getCapability(board, Board::FunctionSwitchGroups);
+    if (funcSwGrps) {
+      for (int i = 1; i <= funcSwGrps; i++) {
+        node["cfsGroupOn"][std::to_string(i)]["v"] = rhs.cfsGroupOn[i];
+      }
     }
   }
 
@@ -1559,7 +1562,7 @@ bool convert<ModelData>::decode(const Node& node, ModelData& rhs)
       rhs.customSwitches[i].group = v & 3;
       v >>= 2;
     }
-    for (int i = 0; i < 4; i += 1) {
+    for (int i = 0; i < CPN_MAX_CUSTOMSWITCH_GROUPS; i += 1) {
       rhs.cfsGroupOn[i] = v & 1;
       v >>= 1;
     }
@@ -1601,8 +1604,8 @@ bool convert<ModelData>::decode(const Node& node, ModelData& rhs)
       }
     }
   }
-  int funcSwCnt = Boards::getCapability(board, Board::FunctionSwitches);
   if (node["customSwitches"]) {
+    int funcSwCnt = Boards::getCapability(board, Board::FunctionSwitches);
     for (int i = 0; i < funcSwCnt; i += 1) {
       int sw = Boards::getSwitchIndexForCFS(i);
       std::string tag = Boards::getSwitchYamlName(sw, BoardJson::YLT_CONFIG).toStdString();
@@ -1610,7 +1613,7 @@ bool convert<ModelData>::decode(const Node& node, ModelData& rhs)
     }
   }
   if (node["cfsGroupOn"]) {
-    for (int i = 1; i < 4; i += 1) {
+    for (int i = 1; i < CPN_MAX_CUSTOMSWITCH_GROUPS; i += 1) {
       if (node["cfsGroupOn"][std::to_string(i)]) {
         node["cfsGroupOn"][std::to_string(i)]["v"] >> rhs.cfsGroupOn[i];
       }
diff --git a/companion/src/firmwares/modeldata.cpp b/companion/src/firmwares/modeldata.cpp
index 7060e68e1b0..8d8a7c9469a 100644
--- a/companion/src/firmwares/modeldata.cpp
+++ b/companion/src/firmwares/modeldata.cpp
@@ -39,15 +39,96 @@ ModelData::ModelData()
 
 ModelData::ModelData(const ModelData & src)
 {
-  *this = src;
+  copy(src);
 }
 
-ModelData & ModelData::operator = (const ModelData & src)
+ModelData & ModelData::operator=(const ModelData & src)
 {
-  memcpy(reinterpret_cast<void *>(this), &src, sizeof(ModelData));
+  copy(src);
   return *this;
 }
 
+void ModelData::copy(const ModelData & src)
+{
+  memcpy(&semver, &src.semver, sizeof(semver));
+  used = src.used;
+  memcpy(&name, &src.name, sizeof(name));
+  memcpy(&filename, &src.filename, sizeof(filename));
+  memcpy(&labels, &src.labels, sizeof(labels));
+  modelIndex = src.modelIndex;
+  modelUpdated = src.modelUpdated;
+  modelErrors = src.modelErrors;
+  memcpy(&timers[0], &src.timers[0], sizeof(timers[0]) * CPN_MAX_TIMERS);
+  noGlobalFunctions = src.noGlobalFunctions;
+  thrTrim = src.thrTrim;
+  trimInc = src.trimInc;
+  trimsDisplay = src.trimsDisplay;
+  disableThrottleWarning = src.disableThrottleWarning;
+  enableCustomThrottleWarning = src.enableCustomThrottleWarning;
+  customThrottleWarningPosition = src.customThrottleWarningPosition;
+  jitterFilter = src.jitterFilter;
+  beepANACenter = src.beepANACenter;
+  extendedLimits = src.extendedLimits;
+  extendedTrims = src.extendedTrims;
+  throttleReversed = src.throttleReversed;
+  checklistInteractive = src.checklistInteractive;
+  memcpy(&flightModeData[0], &src.flightModeData[0], sizeof(flightModeData[0]) * CPN_MAX_FLIGHT_MODES);
+  memcpy(&mixData[0], &src.mixData[0], sizeof(mixData[0]) * CPN_MAX_MIXERS);
+  memcpy(&limitData[0], &src.limitData[0], sizeof(limitData[0]) * CPN_MAX_CHNOUT);
+  memcpy(&inputNames, &src.inputNames, sizeof(inputNames));
+  memcpy(&expoData[0], &src.expoData[0], sizeof(expoData[0]) * CPN_MAX_EXPOS);
+  memcpy(&curves[0], &src.curves[0], sizeof(curves[0]) * CPN_MAX_CURVES);
+  memcpy(&logicalSw[0], &src.logicalSw[0], sizeof(logicalSw[0]) * CPN_MAX_LOGICAL_SWITCHES);
+  memcpy(&customFn[0], &src.customFn[0], sizeof(customFn[0]) * CPN_MAX_SPECIAL_FUNCTIONS);
+  swashRingData = src.swashRingData;
+  thrTraceSrc = src.thrTraceSrc;
+  switchWarningStates = src.switchWarningStates;
+  thrTrimSwitch = src.thrTrimSwitch;
+  potsWarningMode = src.potsWarningMode;
+  memcpy(&potsWarnEnabled[0], &src.potsWarnEnabled[0], sizeof(potsWarnEnabled[0]) * CPN_MAX_INPUTS);
+  memcpy(&potsWarnPosition[0], &src.potsWarnPosition[0], sizeof(potsWarnPosition[0]) * CPN_MAX_INPUTS);
+  displayChecklist = src.displayChecklist;
+  memcpy(&gvarData[0], &src.gvarData[0], sizeof(gvarData[0]) * CPN_MAX_GVARS);
+  mavlink = src.mavlink;
+  telemetryProtocol = src.telemetryProtocol;
+  frsky = src.frsky;
+  rssiSource = src.rssiSource;
+  rssiAlarms = src.rssiAlarms;
+  showInstanceIds = src.showInstanceIds;
+  memcpy(&bitmap, &src.bitmap, sizeof(bitmap));
+  trainerMode = src.trainerMode;
+  memcpy(&moduleData[0], &src.moduleData[0], sizeof(moduleData[0]) * (CPN_MAX_MODULES + 1));
+  memcpy(&scriptData[0], &src.scriptData[0], sizeof(scriptData[0]) * CPN_MAX_SCRIPTS);
+  memcpy(&sensorData[0], &src.sensorData[0], sizeof(sensorData[0]) * CPN_MAX_SENSORS);
+  toplcdTimer = src.toplcdTimer;
+  customScreens = src.customScreens;
+  topBarData = src.topBarData;
+  memcpy(&topbarWidgetWidth[0], &src.topbarWidgetWidth[0], sizeof(topbarWidgetWidth[0]) * MAX_TOPBAR_ZONES);
+  view = src.view;
+  memcpy(&registrationId, &src.registrationId, sizeof(registrationId));
+  hatsMode = src.hatsMode;
+  radioThemesDisabled = src.radioThemesDisabled;
+  radioGFDisabled = src.radioGFDisabled;
+  radioTrainerDisabled = src.radioTrainerDisabled;
+  modelHeliDisabled = src.modelHeliDisabled;
+  modelFMDisabled = src.modelFMDisabled;
+  modelCurvesDisabled = src.modelCurvesDisabled;
+  modelGVDisabled = src.modelGVDisabled;
+  modelLSDisabled = src.modelLSDisabled;
+  modelSFDisabled = src.modelSFDisabled;
+  modelCustomScriptsDisabled = src.modelCustomScriptsDisabled;
+  modelTelemetryDisabled = src.modelTelemetryDisabled;
+  memcpy(&customSwitches[0], &src.customSwitches[0], sizeof(customSwitches[0]) * CPN_MAX_SWITCHES_FUNCTION);
+  memcpy(&cfsGroupOn[0], &src.cfsGroupOn[0], sizeof(cfsGroupOn[0]) * CPN_MAX_CUSTOMSWITCH_GROUPS);
+  usbJoystickExtMode = src.usbJoystickExtMode;
+  usbJoystickIfMode = src.usbJoystickIfMode;
+  usbJoystickCircularCut = src.usbJoystickCircularCut;
+  memcpy(&usbJoystickCh[0], &src.usbJoystickCh[0], sizeof(usbJoystickCh[0]) * CPN_USBJ_MAX_JOYSTICK_CHANNELS);
+  checklistData = src.checklistData;
+  updRefList = nullptr;
+  memset(&updRefInfo, 0, sizeof(updRefInfo));
+}
+
 ExpoData * ModelData::insertInput(const int idx)
 {
   memmove(&expoData[idx + 1], &expoData[idx], (CPN_MAX_EXPOS - (idx + 1)) * sizeof(ExpoData));
@@ -145,48 +226,130 @@ void ModelData::clearMixes()
 
 void ModelData::clear()
 {
-  memset(reinterpret_cast<void *>(this), 0, sizeof(ModelData));
+  // IMPORTANT: DO NOT USE
+  // memset(reinterpret_cast<void *>(this), 0, sizeof(ModelData));
+  // as struct contains complex data types eg std::string
+
+  memset(&semver, 0, sizeof(semver));
+  used = false;
+  memset(&name, 0, sizeof(name));
+  memset(&filename, 0, sizeof(filename));
+  memset(&labels, 0, sizeof(labels));
   modelIndex = -1;  // an invalid index, this is managed by the TreeView data model
-  moduleData[0].protocol = PULSES_OFF;
-  moduleData[1].protocol = PULSES_OFF;
-  moduleData[0].channelsCount = 8;
-  moduleData[1].channelsStart = 0;
-  moduleData[1].channelsCount = 8;
-  moduleData[0].ppm.delay = 300;
-  moduleData[1].ppm.delay = 300;
-  moduleData[2].ppm.delay = 300;  //Trainer PPM
-  for (int i = 0; i < CPN_MAX_FLIGHT_MODES; i++) {
+  modelUpdated = false;
+  modelErrors = false;
+  noGlobalFunctions = false;
+  thrTrim = false;
+  trimInc = 0;
+  trimsDisplay = 0;
+  disableThrottleWarning = false;
+  enableCustomThrottleWarning = false;
+  customThrottleWarningPosition = 0;
+  jitterFilter = 0;
+  beepANACenter = 0;
+  extendedLimits = false;
+  extendedTrims = false;
+  throttleReversed = false;
+  checklistInteractive = false;
+  memset(&inputNames, 0, sizeof(inputNames));
+  thrTraceSrc = 0;
+  switchWarningStates = 0;
+  thrTrimSwitch = 0;
+  potsWarningMode = 0;
+  mavlink.clear();
+  telemetryProtocol = 0;
+  frsky.clear();
+  rssiSource = 0;
+  rssiAlarms.clear();
+  showInstanceIds = false;
+  memset(&bitmap, 0, sizeof(bitmap));
+  trainerMode = TRAINER_MODE_OFF;
+
+  for (int i = 0; i < CPN_MAX_INPUTS; i++)
+    potsWarnEnabled[i] = false;
+
+  for (int i = 0; i < CPN_MAX_INPUTS; i++)
+    potsWarnPosition[i] = 0;
+
+  displayChecklist = false;
+
+  for (int i = 0; i < CPN_MAX_MODULES + 1/*Trainer*/; i++) // + 1
+    moduleData[i].clear();
+
+  for (int i = 0; i < CPN_MAX_FLIGHT_MODES; i++)
     flightModeData[i].clear(i);
-  }
-  for (int i = 0; i < CPN_MAX_GVARS; i++) {
+
+  for (int i = 0; i < CPN_MAX_GVARS; i++)
     gvarData[i].clear();
-  }
+
   clearInputs();
   clearMixes();
+
   for (int i = 0; i < CPN_MAX_CHNOUT; i++)
     limitData[i].clear();
-  for (int i = 0; i < CPN_MAX_STICKS; i++)
-    expoData[i].clear();
+
   for (int i = 0; i < CPN_MAX_LOGICAL_SWITCHES; i++)
     logicalSw[i].clear();
+
   for (int i = 0; i < CPN_MAX_SPECIAL_FUNCTIONS; i++)
     customFn[i].clear();
+
   for (int i = 0; i < CPN_MAX_CURVES; i++)
     curves[i].clear();
+
   for (int i = 0; i < CPN_MAX_TIMERS; i++)
     timers[i].clear();
+
   swashRingData.clear();
   frsky.clear();
   rssiAlarms.clear();
+
   for (unsigned i = 0; i < CPN_MAX_SENSORS; i++)
     sensorData[i].clear();
 
-  trainerMode = TRAINER_MODE_OFF;
+  toplcdTimer = 0;
+  RadioLayout::init("Layout2P1", customScreens);
+  topBarData.clear();
 
-  const char * layoutId = "Layout2P1";  // currently all using same default though might change for NV14
-  RadioLayout::init(layoutId, customScreens);
+  for (int i = 0; i < MAX_TOPBAR_ZONES; i++)
+    topbarWidgetWidth[i] = 0;
 
+  view = 0;
+  memset(&registrationId, 0, sizeof(registrationId));
   hatsMode = GeneralSettings::HATSMODE_GLOBAL;
+
+  radioThemesDisabled = 0;
+  radioGFDisabled = 0;
+  radioTrainerDisabled = 0;
+  modelHeliDisabled = 0;
+  modelFMDisabled = 0;
+  modelCurvesDisabled = 0;
+  modelGVDisabled = 0;
+  modelLSDisabled = 0;
+  modelSFDisabled = 0;
+  modelCustomScriptsDisabled = 0;
+  modelTelemetryDisabled = 0;
+
+  for (int i = 0; i < CPN_MAX_SWITCHES_FUNCTION; i++)
+    customSwitches[i].clear();
+
+  for (int i = 0; i < CPN_MAX_CUSTOMSWITCH_GROUPS; i++)
+    cfsGroupOn[i] = 0;
+
+  usbJoystickExtMode = 0;
+  usbJoystickIfMode = 0;
+  usbJoystickCircularCut = 0;
+
+  for (int i = 0; i < CPN_USBJ_MAX_JOYSTICK_CHANNELS; i++)
+    usbJoystickCh[i].clear();
+
+  checklistData.clear();
+
+  if (updRefList)
+    delete updRefList;
+
+  updRefList = nullptr;
+  memset(&updRefInfo, 0, sizeof(updRefInfo));
 }
 
 bool ModelData::isEmpty() const
@@ -242,6 +405,7 @@ void ModelData::setDefaultFunctionSwitches(int functionSwitchCount)
     customSwitches[i].onColor.setColor(255, 255, 255);
     customSwitches[i].offColor.setColor(0, 0, 0);
   }
+
   cfsGroupOn[1] = 1;
 }
 
@@ -249,7 +413,7 @@ void ModelData::setDefaultValues(unsigned int id, const GeneralSettings & settin
 {
   clear();
   used = true;
-  sprintf(name, "MODEL%02d", id+1);
+  sprintf(name, "MODEL%02d", id + 1);
   for (int i = 0; i < CPN_MAX_MODULES; i++) {
     moduleData[i].modelId = id + 1;
   }
diff --git a/companion/src/firmwares/modeldata.h b/companion/src/firmwares/modeldata.h
index 3cd71cfc26d..4dd91fe1b19 100644
--- a/companion/src/firmwares/modeldata.h
+++ b/companion/src/firmwares/modeldata.h
@@ -105,9 +105,11 @@ class USBJoystickChData {
     void clear() { memset(reinterpret_cast<void *>(this), 0, sizeof(USBJoystickChData)); }
 };
 
-class customSwitch {
+#define CPN_MAX_CUSTOMSWITCH_GROUPS 4
+
+class CustomSwitchData {
   public:
-    customSwitch() { clear(); }
+    CustomSwitchData() { clear(); }
     Board::SwitchType type;
     unsigned int group;
     unsigned int start;
@@ -117,7 +119,7 @@ class customSwitch {
     unsigned int offColorLuaOverride;
     RGBLedColor onColor;
     RGBLedColor offColor;
-    void clear() { memset(reinterpret_cast<void *>(this), 0, sizeof(customSwitch)); }
+    void clear() { memset(reinterpret_cast<void *>(this), 0, sizeof(CustomSwitchData)); }
 };
 
 class ModelData {
@@ -181,7 +183,7 @@ class ModelData {
 
     char bitmap[CPN_MAX_BITMAP_LEN + 1];
 
-    unsigned int trainerMode;  // TrainerMode
+    unsigned int trainerMode;
 
     ModuleData moduleData[CPN_MAX_MODULES + 1/*trainer*/];
 
@@ -222,8 +224,8 @@ class ModelData {
     };
 
     // Function switches
-    customSwitch customSwitches[CPN_MAX_SWITCHES_FUNCTION];
-    unsigned int cfsGroupOn[4];
+    CustomSwitchData customSwitches[CPN_MAX_SWITCHES_FUNCTION];
+    unsigned int cfsGroupOn[CPN_MAX_CUSTOMSWITCH_GROUPS];
 
     // Custom USB joytsick mapping
     unsigned int usbJoystickExtMode;
@@ -233,7 +235,7 @@ class ModelData {
 
     QByteArray checklistData;
 
-    ModelData & operator = (const ModelData & src);
+    ModelData & operator=(const ModelData & src);
 
     void convert(RadioDataConversionState & cstate);
 
@@ -248,6 +250,7 @@ class ModelData {
     QVector<const MixData *> mixes(int channel) const;
 
     void clear();
+    void copy(const ModelData & src);
     bool isEmpty() const;
     void setDefaultInputs(const GeneralSettings & settings);
     void setDefaultMixes(const GeneralSettings & settings);
diff --git a/companion/src/firmwares/moduledata.cpp b/companion/src/firmwares/moduledata.cpp
index 10dd31024fd..78a5e103cb8 100644
--- a/companion/src/firmwares/moduledata.cpp
+++ b/companion/src/firmwares/moduledata.cpp
@@ -65,6 +65,14 @@ void ModuleData::convert(RadioDataConversionState & cstate)
   }
 }
 
+void ModuleData::clear()
+{
+  memset(reinterpret_cast<void *>(this), 0, sizeof(ModuleData));
+  protocol = PULSES_OFF;
+  channelsCount = 8;
+  ppm.delay = 300;
+}
+
 //  moved from OpenTxFirmware EdgeTX v2.9
 //  only called by ModuleData::convert
 //  TODO: merge with ModuleData::isProtocolAvailable as share much of the same logic
diff --git a/companion/src/firmwares/moduledata.h b/companion/src/firmwares/moduledata.h
index ec81dd619d8..afd95b07ad0 100644
--- a/companion/src/firmwares/moduledata.h
+++ b/companion/src/firmwares/moduledata.h
@@ -215,7 +215,7 @@ class ModuleData {
       unsigned int flags;
     } dsmp;
 
-    void clear() { memset(reinterpret_cast<void *>(this), 0, sizeof(ModuleData)); }
+    void clear();
     void convert(RadioDataConversionState & cstate);
     bool isPxx2Module() const;
     bool supportRxNum() const;