diff --git a/main/application.cc b/main/application.cc
index 84568c11..c21da702 100644
--- a/main/application.cc
+++ b/main/application.cc
@@ -54,7 +54,7 @@ void Application::CheckNewVersion() {
     while (true) {
         if (ota_.CheckVersion()) {
             if (ota_.HasNewVersion()) {
-                Alert("OTA 升级", "正在升级系统", "happy", std::string(p3_upgrade_start, p3_upgrade_end - p3_upgrade_start));
+                Alert("OTA 升级", "正在升级系统", "happy", std::string_view(p3_upgrade_start, p3_upgrade_end - p3_upgrade_start));
                 // Wait for the chat state to be idle
                 do {
                     vTaskDelay(pdMS_TO_TICKS(3000));
@@ -123,33 +123,37 @@ void Application::ShowActivationCode() {
 
     struct digit_sound {
         char digit;
-        const char* sound_data_start;
-        const char* sound_data_end;
+        const char* data;
+        size_t size;
     };
-    digit_sound digit_sounds[] = {
-        {'0', p3_0_start, p3_0_end},
-        {'1', p3_1_start, p3_1_end},
-        {'2', p3_2_start, p3_2_end},
-        {'3', p3_3_start, p3_3_end},
-        {'4', p3_4_start, p3_4_end},
-        {'5', p3_5_start, p3_5_end},
-        {'6', p3_6_start, p3_6_end},
-        {'7', p3_7_start, p3_7_end},
-        {'8', p3_8_start, p3_8_end},
-        {'9', p3_9_start, p3_9_end},
-    };
-    std::string sound = std::string(p3_activation_start, p3_activation_end - p3_activation_start);
+    static const std::array<digit_sound, 10> digit_sounds{{
+        digit_sound{'0', p3_0_start, size_t(p3_0_end - p3_0_start)},
+        digit_sound{'1', p3_1_start, size_t(p3_1_end - p3_1_start)}, 
+        digit_sound{'2', p3_2_start, size_t(p3_2_end - p3_2_start)},
+        digit_sound{'3', p3_3_start, size_t(p3_3_end - p3_3_start)},
+        digit_sound{'4', p3_4_start, size_t(p3_4_end - p3_4_start)},
+        digit_sound{'5', p3_5_start, size_t(p3_5_end - p3_5_start)},
+        digit_sound{'6', p3_6_start, size_t(p3_6_end - p3_6_start)},
+        digit_sound{'7', p3_7_start, size_t(p3_7_end - p3_7_start)},
+        digit_sound{'8', p3_8_start, size_t(p3_8_end - p3_8_start)},
+        digit_sound{'9', p3_9_start, size_t(p3_9_end - p3_9_start)}
+    }};
+
+    // This sentence uses 9KB of SRAM, so we need to wait for it to finish
+    Alert("激活设备", message, "happy", std::string_view(p3_activation_start, p3_activation_end - p3_activation_start));
+    vTaskDelay(pdMS_TO_TICKS(1000));
+    background_task_->WaitForCompletion();
+
     for (const auto& digit : code) {
-        auto it = std::find_if(digit_sounds, digit_sounds + sizeof(digit_sounds) / sizeof(digit_sound),
+        auto it = std::find_if(digit_sounds.begin(), digit_sounds.end(),
             [digit](const digit_sound& ds) { return ds.digit == digit; });
-        if (it != digit_sounds + sizeof(digit_sounds) / sizeof(digit_sound)) {
-            sound += std::string(it->sound_data_start, it->sound_data_end - it->sound_data_start);
+        if (it != digit_sounds.end()) {
+            PlayLocalFile(it->data, it->size);
         }
     }
-    Alert("激活设备", message, "happy", sound);
 }
 
-void Application::Alert(const std::string& status, const std::string& message, const std::string& emotion, const std::string& sound) {
+void Application::Alert(const std::string& status, const std::string& message, const std::string& emotion, const std::string_view& sound) {
     ESP_LOGW(TAG, "Alert %s: %s [%s]", status.c_str(), message.c_str(), emotion.c_str());
     auto display = Board::GetInstance().GetDisplay();
     display->SetStatus(status);
diff --git a/main/application.h b/main/application.h
index b66cdf3b..cd8d7df9 100644
--- a/main/application.h
+++ b/main/application.h
@@ -56,7 +56,7 @@ public:
     bool IsVoiceDetected() const { return voice_detected_; }
     void Schedule(std::function<void()> callback);
     void SetDeviceState(DeviceState state);
-    void Alert(const std::string& status, const std::string& message, const std::string& emotion = "", const std::string& sound = "");
+    void Alert(const std::string& status, const std::string& message, const std::string& emotion = "", const std::string_view& sound = "");
     void AbortSpeaking(AbortReason reason);
     void ToggleChatState();
     void StartListening();
diff --git a/main/boards/common/ml307_board.cc b/main/boards/common/ml307_board.cc
index 11b14386..7ae13ea0 100644
--- a/main/boards/common/ml307_board.cc
+++ b/main/boards/common/ml307_board.cc
@@ -48,10 +48,10 @@ void Ml307Board::WaitForNetworkReady() {
     display->SetStatus("等待网络...");
     int result = modem_.WaitForNetworkReady();
     if (result == -1) {
-        application.Alert("PIN_ERROR", "请插入SIM卡", "sad", std::string(p3_err_pin_start, p3_err_pin_end - p3_err_pin_start));
+        application.Alert("PIN_ERROR", "请插入SIM卡", "sad", std::string_view(p3_err_pin_start, p3_err_pin_end - p3_err_pin_start));
         return;
     } else if (result == -2) {
-        application.Alert("REG_ERROR", "无法接入网络，请检查流量卡状态", "sad", std::string(p3_err_reg_start, p3_err_reg_end - p3_err_reg_start));
+        application.Alert("REG_ERROR", "无法接入网络，请检查流量卡状态", "sad", std::string_view(p3_err_reg_start, p3_err_reg_end - p3_err_reg_start));
         return;
     }
 
diff --git a/main/boards/common/wifi_board.cc b/main/boards/common/wifi_board.cc
index 338ae18a..20847000 100644
--- a/main/boards/common/wifi_board.cc
+++ b/main/boards/common/wifi_board.cc
@@ -52,7 +52,7 @@ void WifiBoard::EnterWifiConfigMode() {
     hint += "\n\n";
     
     // 播报配置 WiFi 的提示
-    application.Alert("配网模式", hint, "", std::string(p3_wificonfig_start, p3_wificonfig_end - p3_wificonfig_start));
+    application.Alert("配网模式", hint, "", std::string_view(p3_wificonfig_start, p3_wificonfig_end - p3_wificonfig_start));
     
     // Wait forever until reset after configuration
     while (true) {
diff --git a/sdkconfig.defaults b/sdkconfig.defaults
index 3ad228f0..fc581e2a 100644
--- a/sdkconfig.defaults
+++ b/sdkconfig.defaults
@@ -21,6 +21,7 @@ CONFIG_MBEDTLS_DYNAMIC_BUFFER=y
 CONFIG_MBEDTLS_SSL_KEEP_PEER_CERTIFICATE=n
 CONFIG_ESP_WIFI_IRAM_OPT=n
 CONFIG_ESP_WIFI_RX_IRAM_OPT=n
+CONFIG_ESP_WIFI_DYNAMIC_RX_MGMT_BUFFER=y
 
 CONFIG_CODEC_I2C_BACKWARD_COMPATIBLE=n