diff --git a/lib_xua/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h b/lib_xua/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
index cd7852f..12fe554 100644
--- a/lib_xua/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
+++ b/lib_xua/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
@@ -21,7 +21,7 @@
 // Enable BOS descriptor only when DFU is enabled since the only capability we advertise is the MSOS desc with DFU interface enumerating as WinUSB.
 // Enumerating with 0 capabilities doesn't seem to be allowed
 #if (XUA_DFU_EN)
-    #define _XUA_ENABLE_BOS_DESC (0)        //alexy 20250822
+    #define _XUA_ENABLE_BOS_DESC (1)        //alexy 20250822
 #else
     #define _XUA_ENABLE_BOS_DESC (0)
 #endif
diff --git a/sw_usb_audio/app_usb_aud_phaten_golden/CMakeLists.txt b/sw_usb_audio/app_usb_aud_phaten_golden/CMakeLists.txt
index 7660b7a..0ff1642 100644
--- a/sw_usb_audio/app_usb_aud_phaten_golden/CMakeLists.txt
+++ b/sw_usb_audio/app_usb_aud_phaten_golden/CMakeLists.txt
@@ -46,7 +46,7 @@ set(SW_USB_AUDIO_FLAGS ${EXTRA_BUILD_FLAGS} -O3
                                             -D${TARGET_BOARD}
                                             -DBCD_DEVICE_J=1
                                             -DBCD_DEVICE_M=0
-                                            -DBCD_DEVICE_N=3
+                                            -DBCD_DEVICE_N=4
                                             -D${CODEC_IC}
                                             -DWINDOWS_OS_DESCRIPTOR_SUPPORT
                                             -DDEBUG_PRINT_ENABLE=0)
@@ -101,6 +101,7 @@ set(APP_COMPILER_FLAGS_ex3d_stereo_2k ${SW_USB_AUDIO_FLAGS}    -DI2S_CHANS_DAC=2
                                                             -DNUM_EX3D_CHAN_OUT=2
                                                             -DINPUT_VOLUME_CONTROL=1
                                                             -DOUTPUT_VOLUME_CONTROL=1
+                                                            -DXUA_DFU_EN=1
                                                             -DSTEREO_2K
                                                             -DHID_CONTROLS=1)
 
@@ -121,6 +122,7 @@ set(APP_COMPILER_FLAGS_ex3d_stereo_8k ${SW_USB_AUDIO_FLAGS}    -DI2S_CHANS_DAC=2
                                                             -DSTREAM_FORMAT_INPUT_2_RESOLUTION_BITS=16
                                                             -DSTREAM_FORMAT_INPUT_3_RESOLUTION_BITS=16
                                                             -DNUM_EX3D_CHAN_OUT=2
+                                                            -DXUA_DFU_EN=1
                                                             -DINPUT_VOLUME_CONTROL=1
                                                             -DOUTPUT_VOLUME_CONTROL=1
                                                             -DSTEREO_8K
@@ -141,6 +143,7 @@ set(APP_COMPILER_FLAGS_ex3d_71_game ${SW_USB_AUDIO_FLAGS}    -DI2S_CHANS_DAC=2
                                                         -DMIN_VOLUME=0xE000
                                                         -DINPUT_VOLUME_CONTROL=1
                                                         -DOUTPUT_VOLUME_CONTROL=1
+                                                        -DXUA_DFU_EN=1
                                                         -DSPATIAL_GAME
                                                         -DHID_CONTROLS=1)
 
@@ -169,9 +172,10 @@ set(APP_COMPILER_FLAGS_ex3d_71_movie ${SW_USB_AUDIO_FLAGS}    -DI2S_CHANS_DAC=2
                                                         -DEQ_EN=1
                                                         -llib_ex3d_movie
                                                         -DNUM_USB_CHAN_OUT=8
-                                                        -DNUM_USB_CHAN_IN=0
+                                                        -DNUM_USB_CHAN_IN=2
                                                         -DNUM_EX3D_CHAN_OUT=2
                                                         -DMIN_VOLUME=0xE000
+                                                        -DXUA_DFU_EN=1
                                                         -DSPATIAL_MOVIE
                                                         -DHID_CONTROLS=1)
 
diff --git a/sw_usb_audio/app_usb_aud_phaten_golden/src/extensions/dsp.c b/sw_usb_audio/app_usb_aud_phaten_golden/src/extensions/dsp.c
index cc0a5e1..5d5b95a 100644
--- a/sw_usb_audio/app_usb_aud_phaten_golden/src/extensions/dsp.c
+++ b/sw_usb_audio/app_usb_aud_phaten_golden/src/extensions/dsp.c
@@ -37,6 +37,7 @@ extern unsigned g_host_os;  // 1 -> Windows, 2 -> Others
 extern void device_reboot(void);
 unsigned g_windows_detect_done = 0;
 unsigned g_ex3d_key_verified = 0;
+int32_t sys_vol = 0;
 enum { OS_WIN = 1, OS_OTHERS = 2 };
 
 extern unsigned g_uac_vol;
@@ -207,8 +208,8 @@ void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudi
     };
     
     buffer_exchange(uc_eq_data, sampsFromUsbToAudio);
-//    sampsFromAudioToUsb[0] = sampsFromUsbToAudio[0];
-//    sampsFromAudioToUsb[1] = sampsFromUsbToAudio[1];
+    sampsFromAudioToUsb[0] =sampsFromUsbToAudio[0];
+    sampsFromAudioToUsb[1] = sampsFromUsbToAudio[1];
 }
 
 #if (HID_CONTROLS == 1)
@@ -515,10 +516,16 @@ void hid_receive_task_in_c(unsigned char * RcvData, unsigned * SendData)
             debug_printf("Set CMD_LMT_THRESHOLD : %d\r\n", threshold);
             if((-35 <= threshold) && (threshold <= 0)) {
                 Ex3dLimiterThreshold = threshold;
-                EX3DAudio_SetLimiterThreshold(Ex3dLimiterThreshold);
             } else {
                 pSendBuf[idx] = 0xFFFFFFFF;
             }
+
+            threshold = Ex3dLimiterThreshold + (sys_vol + Ex3dOnGain + Ex3dExpandGain);
+
+            if((-35 <= threshold) && (threshold <= 0)) {
+                EX3DAudio_SetLimiterThreshold(threshold);
+            }
+
         } else {  // Get
             debug_printf("Get CMD_LMT_THRESHOLD : %d\r\n", Ex3dLimiterThreshold);
             memcpy(&pSendBuf[idx], &Ex3dLimiterThreshold, 4);
@@ -726,7 +733,7 @@ void hid_button_task(chanend_t cc_mic_level, chanend_t c_hidRcvData, chanend_t c
     static uint8_t is_mute_t1 = 0;
     static uint8_t mute_tmr;
     uint8_t tmp = 0;
-    int32_t sys_vol = 0;
+
     static uint8_t is_stable = 1;
     static uint8_t press_hold_cnt = 0;
     // 改动原因：添加LED闪烁相关变量，用于保存原始LED状态
@@ -894,6 +901,13 @@ void hid_button_task(chanend_t cc_mic_level, chanend_t c_hidRcvData, chanend_t c
             // Ex3dExpandGain
             // Ex3dReduceGain
             // Ex3dReduceGain = Ex3dLimiterThreshold - (sys_vol + Ex3dOnGain + Ex3dExpandGain)
+            int32_t threshold = Ex3dLimiterThreshold + (sys_vol + Ex3dOnGain + Ex3dExpandGain);
+
+            if((-35 <= threshold) && (threshold <= 0)) {
+                EX3DAudio_SetLimiterThreshold(threshold);
+                debug_printf("Set CMD_LMT_THRESHOLD : %d\r\n", threshold);
+            }
+
             debug_printf("sys_vol:%d\n", sys_vol);
             debug_printf("on gain:%d\n", Ex3dOnGain);
             debug_printf("limiter Th:%f\n", Ex3dLimiterThreshold);