diff --git a/src/slic3r/Utils/QidiPrinterAgent.cpp b/src/slic3r/Utils/QidiPrinterAgent.cpp
index 6b05480194..22b8d37735 100644
--- a/src/slic3r/Utils/QidiPrinterAgent.cpp
+++ b/src/slic3r/Utils/QidiPrinterAgent.cpp
@@ -188,7 +188,13 @@ bool QidiPrinterAgent::fetch_slot_info(const std::string&        base_url,
             } else if (!setting_id.empty() && has_visible_base_preset(bundle->filaments, setting_id)) {
                 tray.tray_info_idx = setting_id;
             } else {
-                tray.tray_info_idx = bundle->filaments.filament_id_by_type(tray.tray_type);
+                // Retired QD_* protocol ids forward to their minted successors via the shipped ledger.
+                const std::string successor = setting_id.empty() ? std::string()
+                                                                 : resolve_filament_id_succession(setting_id);
+                if (!successor.empty() && has_visible_base_preset(bundle->filaments, successor))
+                    tray.tray_info_idx = successor;
+                else
+                    tray.tray_info_idx = bundle->filaments.filament_id_by_type(tray.tray_type);
             }
 
             // Look up color from dictionary
@@ -324,6 +330,10 @@ void QidiPrinterAgent::parse_filament_sections(const std::string& content, std::
 
 std::string QidiPrinterAgent::map_filament_type_to_setting_id(const std::string& filament_type)
 {
+    // These QD_* protocol ids no longer appear on any preset: they are retired ledger keys
+    // that parse_box_status resolves through resolve_filament_id_succession(). Each literal
+    // must stay a ledger key whose chain ends at a live preset id —
+    // scripts/tests/test_filament_id.py parses this function and enforces that.
     const std::string upper = trim_and_upper(filament_type);
 
     if (upper == "PLA") {
diff --git a/tests/libslic3r/test_filament_id_succession.cpp b/tests/libslic3r/test_filament_id_succession.cpp
index 36268277f8..12fa82f9bb 100644
--- a/tests/libslic3r/test_filament_id_succession.cpp
+++ b/tests/libslic3r/test_filament_id_succession.cpp
@@ -34,6 +34,14 @@ TEST_CASE("filament_id succession follows forwarding chains", "[Preset][filament
         CHECK(follow_filament_id_succession("OFchainB", forwards) == "OFlive00");
         CHECK(follow_filament_id_succession("OFchainC", forwards) == "OFlive00");
     }
+
+    // QidiPrinterAgent resolves device-composed QD_* protocol ids through this same walk;
+    // the map key format carries no OF assumption.
+    SECTION("device-protocol QD_* keys forward like any other id") {
+        const std::map<std::string, std::string> qd = {{"QD_2_1_11", "OFnew001"}};
+        CHECK(follow_filament_id_succession("QD_2_1_11", qd) == "OFnew001");
+        CHECK(follow_filament_id_succession("QD_2_1_12", qd).empty());
+    }
 }
 
 // Cycles are a ledger-validation error (script check 9) and never ship, but the client