diff --git a/neuralnetworks/1.2/vts/functional/GeneratedTests.cpp b/neuralnetworks/1.2/vts/functional/GeneratedTests.cpp
index 79d5a60..9bff09c 100644
--- a/neuralnetworks/1.2/vts/functional/GeneratedTests.cpp
+++ b/neuralnetworks/1.2/vts/functional/GeneratedTests.cpp
@@ -40,8 +40,8 @@
 namespace vts {
 namespace functional {
 
-using ::android::hardware::neuralnetworks::V1_0::implementation::ExecutionCallback;
-using ::android::hardware::neuralnetworks::V1_0::implementation::PreparedModelCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::ExecutionCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::PreparedModelCallback;
 using ::android::nn::allocateSharedMemory;
 using ::test_helper::MixedTypedExample;
 
diff --git a/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_0.cpp b/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_0.cpp
index 42e22b0..56a61d4 100644
--- a/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_0.cpp
+++ b/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_0.cpp
@@ -40,8 +40,8 @@
 namespace vts {
 namespace functional {
 
-using ::android::hardware::neuralnetworks::V1_0::implementation::ExecutionCallback;
-using ::android::hardware::neuralnetworks::V1_0::implementation::PreparedModelCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::ExecutionCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::PreparedModelCallback;
 using ::android::nn::allocateSharedMemory;
 using ::test_helper::MixedTypedExample;
 
diff --git a/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_1.cpp b/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_1.cpp
index aab5cb6..1c781ec 100644
--- a/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_1.cpp
+++ b/neuralnetworks/1.2/vts/functional/GeneratedTestsV1_1.cpp
@@ -40,8 +40,8 @@
 namespace vts {
 namespace functional {
 
-using ::android::hardware::neuralnetworks::V1_0::implementation::ExecutionCallback;
-using ::android::hardware::neuralnetworks::V1_0::implementation::PreparedModelCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::ExecutionCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::PreparedModelCallback;
 using ::android::nn::allocateSharedMemory;
 using ::test_helper::MixedTypedExample;
 
diff --git a/neuralnetworks/1.2/vts/functional/ValidateModel.cpp b/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
index c4f1b5e..8024992 100644
--- a/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
+++ b/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
@@ -25,15 +25,14 @@
 namespace neuralnetworks {
 namespace V1_2 {
 
-using V1_0::IPreparedModel;
 using V1_0::OperandLifeTime;
 using V1_1::ExecutionPreference;
 
 namespace vts {
 namespace functional {
 
-using ::android::hardware::neuralnetworks::V1_0::implementation::ExecutionCallback;
-using ::android::hardware::neuralnetworks::V1_0::implementation::PreparedModelCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::ExecutionCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::PreparedModelCallback;
 
 ///////////////////////// UTILITY FUNCTIONS /////////////////////////
 
@@ -62,7 +61,7 @@
     preparedModelCallback->wait();
     ErrorStatus prepareReturnStatus = preparedModelCallback->getStatus();
     ASSERT_EQ(ErrorStatus::INVALID_ARGUMENT, prepareReturnStatus);
-    sp<IPreparedModel> preparedModel = preparedModelCallback->getPreparedModel();
+    sp<IPreparedModel> preparedModel = getPreparedModel_1_2(preparedModelCallback);
     ASSERT_EQ(nullptr, preparedModel.get());
 }
 
diff --git a/neuralnetworks/1.2/vts/functional/ValidateRequest.cpp b/neuralnetworks/1.2/vts/functional/ValidateRequest.cpp
index b663535..e2722aa 100644
--- a/neuralnetworks/1.2/vts/functional/ValidateRequest.cpp
+++ b/neuralnetworks/1.2/vts/functional/ValidateRequest.cpp
@@ -33,8 +33,8 @@
 namespace vts {
 namespace functional {
 
-using ::android::hardware::neuralnetworks::V1_0::implementation::ExecutionCallback;
-using ::android::hardware::neuralnetworks::V1_0::implementation::PreparedModelCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::ExecutionCallback;
+using ::android::hardware::neuralnetworks::V1_2::implementation::PreparedModelCallback;
 using ::android::hidl::memory::V1_0::IMemory;
 using test_helper::for_all;
 using test_helper::MixedTyped;
@@ -68,7 +68,7 @@
     // retrieve prepared model
     preparedModelCallback->wait();
     ErrorStatus prepareReturnStatus = preparedModelCallback->getStatus();
-    *preparedModel = preparedModelCallback->getPreparedModel();
+    *preparedModel = getPreparedModel_1_2(preparedModelCallback);
 
     // The getSupportedOperations_1_2 call returns a list of operations that are
     // guaranteed not to fail if prepareModel_1_2 is called, and
@@ -101,7 +101,8 @@
 
     sp<ExecutionCallback> executionCallback = new ExecutionCallback();
     ASSERT_NE(nullptr, executionCallback.get());
-    Return<ErrorStatus> executeLaunchStatus = preparedModel->execute(request, executionCallback);
+    Return<ErrorStatus> executeLaunchStatus =
+        preparedModel->execute_1_2(request, executionCallback);
     ASSERT_TRUE(executeLaunchStatus.isOk());
     ASSERT_EQ(ErrorStatus::INVALID_ARGUMENT, static_cast<ErrorStatus>(executeLaunchStatus));
 
diff --git a/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.cpp b/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.cpp
index 90a910c..4eced82 100644
--- a/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.cpp
+++ b/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.cpp
@@ -58,6 +58,12 @@
     ::testing::VtsHalHidlTargetTestBase::TearDown();
 }
 
+sp<IPreparedModel> getPreparedModel_1_2(
+    const sp<V1_2::implementation::PreparedModelCallback>& callback) {
+    sp<V1_0::IPreparedModel> preparedModelV1_0 = callback->getPreparedModel();
+    return V1_2::IPreparedModel::castFrom(preparedModelV1_0).withDefault(nullptr);
+}
+
 }  // namespace functional
 }  // namespace vts
 
diff --git a/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.h b/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.h
index a87d788..dedab8d 100644
--- a/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.h
+++ b/neuralnetworks/1.2/vts/functional/VtsHalNeuralnetworks.h
@@ -17,6 +17,8 @@
 #ifndef VTS_HAL_NEURALNETWORKS_V1_2_H
 #define VTS_HAL_NEURALNETWORKS_V1_2_H
 
+#include "Callbacks.h"
+
 #include <android/hardware/neuralnetworks/1.0/types.h>
 #include <android/hardware/neuralnetworks/1.1/types.h>
 #include <android/hardware/neuralnetworks/1.2/IDevice.h>
@@ -77,6 +79,10 @@
 // Tag for the generated tests
 class GeneratedTest : public NeuralnetworksHidlTest {};
 
+// Utility function to get PreparedModel from callback and downcast to V1_2.
+sp<IPreparedModel> getPreparedModel_1_2(
+    const sp<V1_2::implementation::PreparedModelCallback>& callback);
+
 }  // namespace functional
 }  // namespace vts