diff --git a/src/slic3r/Utils/QidiPrinterAgent.cpp b/src/slic3r/Utils/QidiPrinterAgent.cpp
index c2dc4411a6..063f7721f0 100644
--- a/src/slic3r/Utils/QidiPrinterAgent.cpp
+++ b/src/slic3r/Utils/QidiPrinterAgent.cpp
@@ -73,7 +73,14 @@ bool QidiPrinterAgent::fetch_filament_info(std::string dev_id, FilamentSyncMode
     // 3. Fetch slot info and build AmsTrayData directly
     std::vector<AmsTrayData> trays;
     int                      box_count = 0;
-    if (!fetch_slot_info(device_info.base_url, device_info.api_key, dict, series_id, trays, box_count, error)) {
+    bool                     slots_ok  = false;
+    try {
+        slots_ok = fetch_slot_info(device_info.base_url, device_info.api_key, dict, series_id, trays, box_count, error);
+    } catch (const nlohmann::json::exception& e) {
+        // A slot value of an unexpected type fails the sync instead of escaping to the UI
+        error = e.what();
+    }
+    if (!slots_ok) {
         BOOST_LOG_TRIVIAL(warning) << "QidiPrinterAgent::fetch_filament_info: Failed to fetch slot info: " << error;
         return false;
     }
@@ -91,7 +98,7 @@ bool QidiPrinterAgent::fetch_slot_info(const std::string&        base_url,
                                        int&                      box_count,
                                        std::string&              error)
 {
-    std::string url = join_url(base_url, "/printer/objects/query?save_variables=variables");
+    std::string url = join_url(base_url, "/printer/objects/query?save_variables=variables&multi_color_controller=box");
     for (int i = 0; i < 16; ++i) {
         url += "&box_stepper%20slot" + std::to_string(i) + "=runout_button";
     }
@@ -164,9 +171,12 @@ bool QidiPrinterAgent::fetch_slot_info(const std::string&        base_url,
         AmsTrayData tray;
         tray.slot_index = i;
 
-        // Read slot variables
-        const int color_index     = variables.value("color_slot" + std::to_string(i), 1);
-        const int filament_type   = variables.value("filament_slot" + std::to_string(i), 1);
+        // Read slot variables. Newer firmware stores a hex color list and a material id instead of dictionary
+        // indexes, and only in the slots it has rewritten, so each slot is checked for both forms.
+        const auto color_value    = variables.value("color_slot" + std::to_string(i), nlohmann::json(1));
+        const auto filament_value = variables.value("filament_slot" + std::to_string(i), nlohmann::json(1));
+        const int color_index     = color_value.is_number() ? color_value.get<int>() : 0;
+        const int filament_type   = filament_value.is_number() ? filament_value.get<int>() : 0;
         const int vendor_type     = variables.value("vendor_slot" + std::to_string(i), 0);
 
         // Check filament presence via runout sensor
@@ -187,6 +197,13 @@ bool QidiPrinterAgent::fetch_slot_info(const std::string&        base_url,
             if (filament_it != dict.filaments.end()) {
                 filament_name = filament_it->second;
             }
+            if (filament_value.is_string()) {
+                const nlohmann::json::json_pointer decoded_type("/multi_color_controller/box/box" + std::to_string(i / 4) +
+                                                                "_filament_info_" + std::to_string(i % 4) + "_filament_type");
+                if (status.contains(decoded_type) && status[decoded_type].is_string()) {
+                    filament_name = status[decoded_type].get<std::string>();
+                }
+            }
             tray.tray_type = normalize_filament_type(filament_name);
 
             // Try Qidi-specific setting ID first; fall back to visible preset by type
@@ -202,7 +219,9 @@ bool QidiPrinterAgent::fetch_slot_info(const std::string&        base_url,
 
             // Look up color from dictionary
             auto color_it = dict.colors.find(color_index);
-            if (color_it != dict.colors.end()) {
+            if (color_value.is_array() && !color_value.empty() && color_value[0].is_string()) {
+                tray.tray_color = color_value[0].get<std::string>();
+            } else if (color_it != dict.colors.end()) {
                 tray.tray_color = color_it->second;
             } else {
                 tray.tray_color = "FFFFFFFF";