diff --git a/install/include/install/install.h b/install/include/install/install.h
index 704841f8..12a73cc5 100644
--- a/install/include/install/install.h
+++ b/install/include/install/install.h
@@ -67,3 +67,5 @@ bool CheckPackageMetadata(const std::map<std::string, std::string>& metadata, Ot
 // Ensures the path to the update package is mounted. Also set the |should_use_fuse| to true if the
 // package stays on a removable media.
 bool SetupPackageMount(const std::string& package_path, bool* should_use_fuse);
+
+bool Check_downgrade(Package* package, RecoveryUI* ui);
diff --git a/install/install.cpp b/install/install.cpp
index 4a795259..a282b582 100644
--- a/install/install.cpp
+++ b/install/install.cpp
@@ -663,6 +663,30 @@ static InstallResult TryUpdateBinary(Package* package, bool* wipe_cache,
   return INSTALL_SUCCESS;
 }
 
+bool Check_downgrade(Package* package, RecoveryUI* ui) {
+
+  if (!verify_package(package, ui)) {
+    // log_buffer->push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure));
+    return false;
+  }
+  std::map<std::string, std::string> metadata;
+  auto zip = package->GetZipArchiveHandle();
+  if (!ReadMetadataFromPackage(zip, &metadata)) {
+    LOG(ERROR) << "Failed to parse metadata in the zip file";
+    return false;
+  }
+
+  auto pkg_support_sdk = get_value(metadata,"post-sdk-level");
+  if (!pkg_support_sdk.empty()) {
+    int64_t support = 0;
+    android::base::ParseInt(pkg_support_sdk, &support);
+    ui->Print("kbdbg Check_downgrade target sdk verison:%lld\n", support);
+    if (support < 31)
+      return true;
+  }
+  return false;
+}
+
 static InstallResult VerifyAndInstallPackage(Package* package, bool* wipe_cache,
                                              std::vector<std::string>* log_buffer, int retry_count,
                                              int* max_temperature, RecoveryUI* ui) {
diff --git a/sptek_recovery/sptek_control.cpp b/sptek_recovery/sptek_control.cpp
index ed8572c4..21e65d71 100644
--- a/sptek_recovery/sptek_control.cpp
+++ b/sptek_recovery/sptek_control.cpp
@@ -453,6 +453,40 @@ bool SPTekControl::sRunDownloadUpgrade(int upgradeMode){
                              mUpdatePackage,
                              std::bind(&RecoveryUI::SetProgress, mUI, std::placeholders::_1));
 
+        if(Check_downgrade(memory_package.get(), mUI)) {
+            LOG(INFO) << "Check_downgrade Start wiping data.\n";
+            printf("Check_downgrade Start wiping data.\n");
+
+            mUI->SetBackground(RecoveryUI::FACTORY_RESET);
+            /* factory reset operation is very short. so we need to wait here */
+            sleep(5);
+            
+            setWipeCacheValue(false);
+            //bool convert_fbe = reason && strcmp(reason, "convert_fbe") == 0;
+            bool convert_fbe = mDevice->GetReason().value() == "convert_fbe";
+            if (!WipeData(mDevice, convert_fbe)) {
+                status = INSTALL_ERROR;
+            }
+      
+            if (status != INSTALL_SUCCESS) {
+                mUI->Print("Data wipe failed.\n");
+                LOG(ERROR) << "Data wipe failed.\n";
+            } else {
+                mUI->Print("Data wipe success.\n");
+                LOG(INFO) << "Data wipe success.\n";
+                if (ensure_path_mounted("/btv_home/backup") != 0 || ensure_path_mounted("/data/app") != 0) {
+                    printf("btv_home backup dir mount fail.\n");
+                    LOG(INFO) << "btv_home backup dir mount fail.\n";
+                } else {
+                    printf("btv_home backup dir mount success.\n");
+                    LOG(INFO) << "btv_home backup dir mount success.\n";
+                }
+            }
+			printf("resetting partial number\n");
+			set_partial_reset();
+        }
+
+
         if (memory_package != nullptr) {
             status = InstallPackage(memory_package.get(), mUpdatePackage, should_wipe_cache,
                                 0, mUI);