diff --git a/DynObj.cpp b/DynObj.cpp
index 24d31fc6..15fa0db7 100644
--- a/DynObj.cpp
+++ b/DynObj.cpp
@@ -5041,7 +5041,8 @@ TDynamicObject::radius() const {
 // McZapkie-250202
 // wczytywanie pliku z danymi multimedialnymi (dzwieki)
 void TDynamicObject::LoadMMediaFile( std::string const &TypeName, std::string const &ReplacableSkin ) {
-
+	rTypeName = TypeName;
+	rReplacableSkin = ReplacableSkin;
     Global.asCurrentDynamicPath = asBaseDir;
     std::string asFileName = asBaseDir + TypeName + ".mmd";
     std::string asAnimName;
diff --git a/DynObj.h b/DynObj.h
index d97826c3..5de745e5 100644
--- a/DynObj.h
+++ b/DynObj.h
@@ -209,7 +209,11 @@ public:
     inline TDynamicObject *PrevConnected() const { return MoverParameters->Neighbours[ end::front ].vehicle; }; // pojazd podłączony od strony sprzęgu 0 (kabina 1)
     inline int NextConnectedNo() const { return MoverParameters->Neighbours[ end::rear ].vehicle_end; }
     inline int PrevConnectedNo() const { return MoverParameters->Neighbours[ end::front ].vehicle_end; }
-//    double fTrackBlock; // odległość do przeszkody do dalszego ruchu (wykrywanie kolizji z innym pojazdem)
+
+    // Dev tools
+	void Reload();
+
+	//    double fTrackBlock; // odległość do przeszkody do dalszego ruchu (wykrywanie kolizji z innym pojazdem)
 
     // modele składowe pojazdu
     TModel3d *mdModel; // model pudła
@@ -573,6 +577,9 @@ private:
     TDynamicObject *ABuFindObject( int &Foundcoupler, double &Distance, TTrack const *Track, int const Direction, int const Mycoupler ) const;
     void ABuCheckMyTrack();
 
+    std::string rTypeName; // nazwa typu pojazdu
+	std::string rReplacableSkin; // nazwa tekstury pojazdu
+
   public:
     bool DimHeadlights{ false }; // status of the headlight dimming toggle. NOTE: single toggle for all lights is a simplification. TODO: separate per-light switches
 	bool HighBeamLights { false }; // status of the highbeam toggle
diff --git a/McZapkie/MOVER.h b/McZapkie/MOVER.h
index c2f00b3b..7d38bbb9 100644
--- a/McZapkie/MOVER.h
+++ b/McZapkie/MOVER.h
@@ -1069,6 +1069,8 @@ class TMoverParameters
 	};
 
   public:
+	std::string chkPath;
+	bool reload_FIZ();
 	double dMoveLen = 0.0;
 	/*---opis lokomotywy, wagonu itp*/
 	/*--opis serii--*/
diff --git a/McZapkie/Mover.cpp b/McZapkie/Mover.cpp
index 96185aee..81f0750a 100644
--- a/McZapkie/Mover.cpp
+++ b/McZapkie/Mover.cpp
@@ -9444,6 +9444,7 @@ void TMoverParameters::BrakeSubsystemDecode()
 // *************************************************************************************************
 bool TMoverParameters::LoadFIZ(std::string chkpath)
 {
+	chkPath = chkpath; // assign class path for reloading
     const int param_ok = 1;
     const int wheels_ok = 2;
     const int dimensions_ok = 4;
@@ -12473,6 +12474,24 @@ double TMoverParameters::ShowCurrentP(int AmpN) const
     }
 }
 
+bool TMoverParameters::reload_FIZ() {
+	WriteLog("[DEV] Reloading FIZ for " + Name);
+    // pause simulation
+	Global.iPause |= 0b1000;
+	bool result = LoadFIZ(chkPath);
+    if (result == true)
+    {
+		// jesli sie udalo przeladowac FIZ
+		Global.iPause &= 0b0111;
+		WriteLog("[DEV] FIZ reloaded for " + Name);
+    }
+    else {
+        // failed to reload - exit simulator
+		ErrorLog("[DEV] Failed to reload fiz for vehicle " + Name);
+    }
+
+}
+
 namespace simulation {
 
 weights_table Weights;
diff --git a/driveruipanels.cpp b/driveruipanels.cpp
index b4e8c70c..872cf244 100644
--- a/driveruipanels.cpp
+++ b/driveruipanels.cpp
@@ -622,6 +622,7 @@ debug_panel::render() {
         render_section( "Camera", m_cameralines );
         render_section( "Gfx Renderer", m_rendererlines );
         render_section_settings();
+		render_section_developer(); // Developer tools
 #ifdef WITH_UART
         if(true == render_section( "UART", m_uartlines)) {
             int ports_num = UartStatus.available_ports.size();
@@ -1492,6 +1493,19 @@ debug_panel::render_section( std::vector<text_line> const &Lines ) {
 	return true;
 }
 
+bool debug_panel::render_section_developer()
+{
+	if (false == ImGui::CollapsingHeader("Developer tools"))
+		return false;
+	ImGui::PushStyleColor(ImGuiCol_Text, {Global.UITextColor.r, Global.UITextColor.g, Global.UITextColor.b, Global.UITextColor.a});
+	ImGui::TextUnformatted("Warning! These tools are only for developers.\nDo not use them if you are NOT sure what they do!");
+	ImGui::TextColored(ImVec4(1.0f, 0.0f, 0.0f, 1.0f), "These settings may crash your simulator!");
+	if (ImGui::Button("Reload current vehicle .fiz") == true)
+	{
+		m_input.vehicle->MoverParameters->reload_FIZ(); // reload fiz
+	}
+}
+
 bool
 debug_panel::render_section_settings() {
 
diff --git a/driveruipanels.h b/driveruipanels.h
index e1a9acbe..f34a601e 100644
--- a/driveruipanels.h
+++ b/driveruipanels.h
@@ -104,7 +104,8 @@ private:
     bool render_section_uart();
 #endif
     bool render_section_settings();
-// members
+	bool render_section_developer();
+	    // members
     std::array<char, 1024> m_buffer;
     std::array<char, 128> m_eventsearch;
     input_data m_input;