diff --git a/src/controllers/installationController.js b/src/controllers/installationController.js
index d8f66635..7d91e8c7 100644
--- a/src/controllers/installationController.js
+++ b/src/controllers/installationController.js
@@ -4136,127 +4136,89 @@ exports.particularCategory = async (req, reply) => {
 
     const support = await Support.findOne({ supportId }).lean();
     if (!support) {
-      return reply.code(404).send({ message: 'Support record not found' });
+      return reply.code(404).send({ message: "Support record not found" });
     }
 
-    const issues = (support.categorizedIssues || []).filter(
-      (issue) => issue.category === category
-    );
-
+    const issues = (support.categorizedIssues || []).filter(issue => issue.category === category);
     if (issues.length === 0) {
       return reply.code(404).send({ message: `No issues found for category: ${category}` });
     }
 
-    // ✅ Extract master hardwareIds from categorized issues
-    const hardwareIds = [];
-    for (const issue of issues) {
-      if (issue.hardwareId) hardwareIds.push(issue.hardwareId);
-      if (Array.isArray(issue.hardwareIds)) hardwareIds.push(...issue.hardwareIds);
-    }
-
-    const uniqueHardwareIds = [...new Set(hardwareIds.map(id => id.trim()))];
-
-    if (!uniqueHardwareIds.length) {
-      return reply.code(404).send({ message: "No hardware IDs found in issues." });
-    }
-
-    // ✅ Find sensors involved
-    const sensors = await Insensors.find({
-      $or: [
-        { hardwareId: { $in: uniqueHardwareIds } },
-        { connected_to: { $in: uniqueHardwareIds } }
-      ]
+    const hardwareIds = issues.map(issue => issue.hardwareId).filter(Boolean);
+    const insensors = await Insensors.find({
+      hardwareId: { $in: hardwareIds },
+      connected_status: "disconnected"
     }).lean();
 
-    if (!sensors.length) {
-      return reply.code(404).send({ message: "No related sensors found." });
+    if (!insensors.length) {
+      return reply.code(404).send({ message: "No disconnected devices found for this category." });
     }
 
-    // ✅ Get customerId from first issue (assuming same customer)
-    const customerId = support.customerId || sensors[0]?.customerId;
-
-    // ✅ Get order map
-    const orders = await Order.find({ customerId }).lean();
     const orderMap = {};
-    orders.forEach(order => {
-      order.master_connections.forEach(connection => {
-        orderMap[connection.hardwareId] = {
-          masterName: connection.master_name || null,
-          location: connection.location || null
-        };
+    const customerId = insensors[0]?.customerId;
+    if (customerId) {
+      const orders = await Order.find({ customerId }).lean();
+      orders.forEach(order => {
+        order.master_connections.forEach(conn => {
+          orderMap[conn.hardwareId] = {
+            masterName: conn.master_name || null,
+            location: conn.location || null
+          };
+        });
       });
-    });
-
-    // ✅ Get master hardwareIds
-    const masterHardwareIds = uniqueHardwareIds;
-
-    // ✅ Build enriched master list
-    const enrichedMasters = await Promise.all(masterHardwareIds.map(async (hardwareId) => {
-      const latestRecord = await IotData.findOne({ hardwareId }).sort({ date: -1 }).lean();
-      const orderInfo = orderMap[hardwareId] || {};
-
-      if (!latestRecord) {
-        return {
-          hardwareId,
-          message: "No IoT data found",
-          masterName: orderInfo.masterName ?? null,
-          location: orderInfo.location ?? null,
-          tanks: []
-        };
-      }
-
-      // ✅ Check GSM status
-      const indiaTime = moment.tz(latestRecord.date, "Asia/Kolkata");
-      const now = moment.tz("Asia/Kolkata");
-      const diffInMinutes = now.diff(indiaTime, "minutes");
-      const gsmConnected = diffInMinutes <= 1;
-      const message = gsmConnected ? "GSM is connected" : "GSM is not connected";
-
-      // ✅ Get slaves connected to this master
-      const connectedSlaves = sensors.filter(sensor => sensor.connected_to?.trim() === hardwareId);
+    }
 
-      // ✅ Prepare tank info
-      const tanks = connectedSlaves.map(slave => {
-        const slaveId = slave.tankhardwareId?.trim();
-        const matchedTank = latestRecord.tanks?.find(t => t.tankhardwareId === slaveId);
+    const disconnectedIssues = [];
 
-        let loraMessage = "LORA is not connected";
+    for (const master of insensors.filter(i => i.type === "master")) {
+      const slaves = await Insensors.find({
+        connected_to: master.hardwareId,
+        connected_status: "disconnected"
+      }).lean();
 
-        if (matchedTank?.date && matchedTank.tankHeight !== "0") {
-          const tankTime = moment.tz(matchedTank.date, "Asia/Kolkata");
-          const loraDiff = now.diff(tankTime, "minutes");
-          loraMessage = loraDiff <= 1 ? "LORA is connected" : "LORA is not connected";
-        }
+      const slaveDetails = slaves.map(slave => ({
+        hardwareId: slave.hardwareId,
+        tankName: slave.tankName || "",
+        location: slave.tankLocation || "",
+        connected_status: slave.connected_status,
+        connected_lora_time: slave.connected_lora_time || null,
+        connected_lora_date: slave.connected_lora_date || null,
+        lora_last_check_time: slave.lora_last_check_time || null,
+        lora_last_disconnect_time: slave.lora_last_disconnect_time || null,
+        connected_to: slave.connected_to || "",
+        masterName: orderMap[master.hardwareId]?.masterName || "",
+        type: "slave",
+        typeOfWater: slave.typeOfWater || "",
+        support_lora_last_check_time: null
+      }));
 
-        return {
-          tankhardwareId: slaveId,
-          tankName: slave.tankName ?? null,
-          tankLocation: slave.tankLocation ?? null,
-          masterName: orderInfo.masterName ?? null,
-          location: orderInfo.location ?? null,
-          loraMessage,
-          latestTankData: matchedTank ?? null
-        };
+      disconnectedIssues.push({
+        hardwareId: master.hardwareId,
+        masterName: orderMap[master.hardwareId]?.masterName || "",
+        location: orderMap[master.hardwareId]?.location || "",
+        type: "master",
+        connected_status: master.connected_status,
+        gsm_last_check_time: master.gsm_last_check_time || null,
+        gsm_last_disconnect_time: master.gsm_last_disconnect_time || null,
+        connected_gsm_date: master.connected_gsm_date || null,
+        connected_gsm_time: master.connected_gsm_time || null,
+        connected_lora_date: master.connected_lora_date || null,
+        connected_lora_time: master.connected_lora_time || null,
+        support_gsm_last_check_time: null,
+        connected_slave_count: slaveDetails.length,
+        connected_slaves: slaveDetails
       });
-
-      return {
-        hardwareId,
-        message,
-        masterName: orderInfo.masterName ?? null,
-        location: orderInfo.location ?? null,
-        tanks
-      };
-    }));
+    }
 
     return reply.send({
       status_code: 200,
-      category,
-      message: "IoT data fetched for category",
-      data: enrichedMasters
+      supportId,
+      totalMasters: disconnectedIssues.length,
+      disconnectedIssues
     });
 
   } catch (err) {
     console.error("Error in particularCategory:", err);
-    return reply.code(500).send({ error: "Internal Server Error" });
+    return reply.code(500).send({ error: "Internal server error" });
   }
 };