diff --git a/examples/09_a2dp/components/bluedroid_demos/app_project/SampleBtSdp.c b/examples/09_a2dp/components/bluedroid_demos/app_project/SampleBtSdp.c
index e4eb4d873..f5311a8ab 100644
--- a/examples/09_a2dp/components/bluedroid_demos/app_project/SampleBtSdp.c
+++ b/examples/09_a2dp/components/bluedroid_demos/app_project/SampleBtSdp.c
@@ -30,13 +30,8 @@ typedef union {
 
 // extern const btav_interface_t *btif_av_get_sink_interface(void);
 static void bt_stack_evt(tBT_APP_EVT event, tBT_APP_EVT_DATA *p_data);
-static void bt_stack_state_changed(bt_state_t state);
-
 // static bt_bdaddr_t peer_bd_addr = {{0x00, 0x1b, 0xdc, 0x08, 0x0f, 0xe7}};
 
-static bt_callbacks_t bt_callbacks = {
-    bt_stack_state_changed
-};
 
 osi_alarm_t *app_alarm = NULL;
 
@@ -112,19 +107,19 @@ static void bt_stack_evt(tBT_APP_EVT event, tBT_APP_EVT_DATA *p_data)
                             (void *)p_data, sizeof(tBT_APP_EVT_DATA), NULL);
 }
 
-static void bt_stack_state_changed(bt_state_t state)
-{
-    if (state == BT_STATE_ON) {
-        bt_stack_evt(BT_APP_EVT_STACK_ON, NULL);
-    }
-}
-
 void app_main_entry(void)
 {
-    bt_status_t stat;
-    stat = BTIF_InitStack(&bt_callbacks);
-    if (stat == BT_STATUS_SUCCESS) {
-        BTIF_EnableStack();
+    bt_status_t init, enable;
+    init = BTIF_InitStack();
+    if (init != BT_STATUS_SUCCESS) {
+        return;
     }
+
+    enable = BTIF_EnableStack();
+    if (enable != BT_STATUS_SUCCESS) {
+        return;
+    }
+    
+    bt_stack_evt(BT_APP_EVT_STACK_ON, NULL);
 }
 
diff --git a/examples/09_a2dp/components/bluedroid_demos/btif/include/btif_stack_manager.h b/examples/09_a2dp/components/bluedroid_demos/btif/include/btif_stack_manager.h
index a780fded2..649a05de0 100644
--- a/examples/09_a2dp/components/bluedroid_demos/btif/include/btif_stack_manager.h
+++ b/examples/09_a2dp/components/bluedroid_demos/btif/include/btif_stack_manager.h
@@ -20,7 +20,7 @@ typedef struct {
     adapter_state_changed_callback adapter_state_changed_cb;
 } bt_callbacks_t;
 
-bt_status_t BTIF_InitStack(bt_callbacks_t *cb);
+bt_status_t BTIF_InitStack(void);
 
 bt_status_t BTIF_EnableStack(void);
 
diff --git a/examples/09_a2dp/components/bluedroid_demos/btif/stack_manager.c b/examples/09_a2dp/components/bluedroid_demos/btif/stack_manager.c
index 49facf1cc..a93c3e8f6 100644
--- a/examples/09_a2dp/components/bluedroid_demos/btif/stack_manager.c
+++ b/examples/09_a2dp/components/bluedroid_demos/btif/stack_manager.c
@@ -20,17 +20,14 @@
 ************************************************************************************/
 static bool stack_is_initialized = false;
 static bool stack_is_running = false;
-static bt_callbacks_t *bt_hal_cbacks = NULL;
 static future_t *hack_future = NULL;
 
-static bt_status_t event_init_stack(bt_callbacks_t *cb);
+static bt_status_t event_init_stack(void);
 static bt_status_t event_start_up_stack(void);
 static bt_status_t event_shut_down_stack(void);
 static bt_status_t event_clean_up_stack(void);
-static void event_signal_stack_up(UNUSED_ATTR uint16_t event, UNUSED_ATTR char *p_param);
-static void event_signal_stack_down(UNUSED_ATTR uint16_t event, UNUSED_ATTR char *p_param);
 
-static bt_status_t event_init_stack(bt_callbacks_t *cb)
+static bt_status_t event_init_stack(void)
 {
     bt_status_t ret;
     if (!stack_is_initialized) {
@@ -40,7 +37,6 @@ static bt_status_t event_init_stack(bt_callbacks_t *cb)
             return BT_STATUS_FAIL;
         }
         if (ret == BT_STATUS_SUCCESS) {
-            bt_hal_cbacks = cb;
             stack_is_initialized = true;
         }
         return ret;
@@ -74,7 +70,6 @@ static bt_status_t event_start_up_stack(void)
 
     stack_is_running = true;
     LOG_DEBUG("%s finished\n", __func__);
-    btif_transfer_context(event_signal_stack_up, 0, NULL, 0, NULL);
     return BT_STATUS_SUCCESS;
 }
 
@@ -94,7 +89,6 @@ static bt_status_t event_shut_down_stack(void)
     future_await(hack_future);
 
     LOG_DEBUG("%s finished.\n", __func__);
-    btif_transfer_context(event_signal_stack_down, 0, NULL, 0, NULL);
     return BT_STATUS_SUCCESS;
 }
 
@@ -118,19 +112,9 @@ static bt_status_t event_clean_up_stack(void)
     return BT_STATUS_SUCCESS;
 }
 
-static void event_signal_stack_up(UNUSED_ATTR uint16_t event, UNUSED_ATTR char *p_param)
+bt_status_t BTIF_InitStack(void)
 {
-    HAL_CBACK(bt_hal_cbacks, adapter_state_changed_cb, BT_STATE_ON);
-}
-
-static void event_signal_stack_down(UNUSED_ATTR uint16_t event, UNUSED_ATTR char *p_param)
-{
-    HAL_CBACK(bt_hal_cbacks, adapter_state_changed_cb, BT_STATE_OFF);
-}
-
-bt_status_t BTIF_InitStack(bt_callbacks_t *cb)
-{
-    return event_init_stack(cb);
+    return event_init_stack();
 }
 
 bt_status_t BTIF_EnableStack(void)