diff --git a/dao/src/main/java/org/thingsboard/server/dao/ota/BaseOtaPackageService.java b/dao/src/main/java/org/thingsboard/server/dao/ota/BaseOtaPackageService.java
index 54577ff9eb..c43274cc26 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/ota/BaseOtaPackageService.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/ota/BaseOtaPackageService.java
@@ -234,10 +234,10 @@ public class BaseOtaPackageService extends AbstractCachedEntityService<OtaPackag
         try {
             Integer result = otaPackageDao.unlinkLargeObject(oid);
             if (result != 1) {
-                log.warn("[{}][{}] Failed to delete large object (OID: {}). Result code: {}", tenantId, otaPackageId, oid, result);
+                log.error("[{}][{}] Failed to delete large object (OID: {}). Result code: {}", tenantId, otaPackageId, oid, result);
             }
         } catch (Exception e) {
-            log.warn("[{}][{}] Failed to delete large object (OID: {})", tenantId, otaPackageId, oid, e);
+            log.error("[{}][{}] Failed to delete large object (OID: {})", tenantId, otaPackageId, oid, e);
         }
     }
 
diff --git a/dao/src/main/java/org/thingsboard/server/dao/sql/ota/OtaPackageRepository.java b/dao/src/main/java/org/thingsboard/server/dao/sql/ota/OtaPackageRepository.java
index 1e80bb1597..a8f3483dbc 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/sql/ota/OtaPackageRepository.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/sql/ota/OtaPackageRepository.java
@@ -15,12 +15,12 @@
  */
 package org.thingsboard.server.dao.sql.ota;
 
-import jakarta.transaction.Transactional;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
+import org.springframework.transaction.annotation.Transactional;
 import org.thingsboard.server.dao.ExportableEntityRepository;
 import org.thingsboard.server.dao.model.sql.OtaPackageEntity;
 
@@ -41,6 +41,7 @@ public interface OtaPackageRepository extends JpaRepository<OtaPackageEntity, UU
     @Query("SELECT r.id FROM OtaPackageEntity r WHERE r.tenantId = :tenantId")
     Page<UUID> findIdsByTenantId(@Param("tenantId") UUID tenantId, Pageable pageable);
 
+    // The 'data' column is of type OID (PostgreSQL large object reference), so it returns the OID as Long
     @Query(value = "SELECT data FROM ota_package WHERE id = :id AND data IS NOT NULL", nativeQuery = true)
     Long getDataOidById(@Param("id") UUID id);
 
diff --git a/dao/src/test/java/org/thingsboard/server/dao/service/OtaPackageServiceTest.java b/dao/src/test/java/org/thingsboard/server/dao/service/OtaPackageServiceTest.java
index e79a7bad07..2f296d38f2 100644
--- a/dao/src/test/java/org/thingsboard/server/dao/service/OtaPackageServiceTest.java
+++ b/dao/src/test/java/org/thingsboard/server/dao/service/OtaPackageServiceTest.java
@@ -44,7 +44,6 @@ import org.thingsboard.server.dao.tenant.TenantProfileService;
 
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -121,10 +120,8 @@ public class OtaPackageServiceTest extends AbstractServiceTest {
         Assert.assertEquals(1, otaPackageService.sumDataSizeByTenantId(tenantId));
 
         int maxSumDataSize = 8;
-        List<OtaPackage> packages = new ArrayList<>(maxSumDataSize);
-
         for (int i = 2; i <= maxSumDataSize; i++) {
-            packages.add(createAndSaveFirmware(tenantId, "0." + i));
+            createAndSaveFirmware(tenantId, "0." + i);
             Assert.assertEquals(i, otaPackageService.sumDataSizeByTenantId(tenantId));
         }
 
@@ -603,8 +600,8 @@ public class OtaPackageServiceTest extends AbstractServiceTest {
             }
         } while (pageData.hasNext());
 
-        Collections.sort(firmwares, idComparator);
-        Collections.sort(loadedFirmwares, idComparator);
+        firmwares.sort(idComparator);
+        loadedFirmwares.sort(idComparator);
 
         assertThat(firmwares).isEqualTo(loadedFirmwares);
 
@@ -658,8 +655,8 @@ public class OtaPackageServiceTest extends AbstractServiceTest {
             }
         } while (pageData.hasNext());
 
-        Collections.sort(firmwares, idComparator);
-        Collections.sort(loadedFirmwares, idComparator);
+        firmwares.sort(idComparator);
+        loadedFirmwares.sort(idComparator);
 
         assertThat(firmwares).isEqualTo(loadedFirmwares);