diff --git a/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc b/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc
index 31847d4..3edff03 100644
--- a/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc
+++ b/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/audiohw.xc
@@ -442,7 +442,7 @@ void button_task(chanend c_hidSendData, chanend cc_mic_level, chanend c_uac_vol,
     unsigned char mic_mute_path[] = "mic_mute";
     unsigned char hp_mute_path[] = "hp_mute";
     unsigned char monitor_sw_path[] = "monitor_sw";
-    unsigned host_os;
+    unsigned host_os = OS_OTHERS;
 #if DNR_ENABLE
     unsigned dnr_init_flag = 0;
     while (dnr_init_flag == 0)
@@ -481,13 +481,15 @@ void button_task(chanend c_hidSendData, chanend cc_mic_level, chanend c_uac_vol,
 #endif
 
 #if defined(UAC1_MODE)
-    delay_milliseconds(300);
-    GET_SHARED_GLOBAL(host_os, g_host_os);
-#endif
+    for(int i = 0; i < 500; i++)
+    {
+        GET_SHARED_GLOBAL(host_os, g_host_os);
+        if (host_os == OS_WIN) {
+            break;
+        }
+        delay_milliseconds(1);
+    }
 
-    printf("host_os: %d\n", host_os);
-
-#if UAC1_MODE == 1
     if (host_os == OS_WIN) {
         printf("Detected Windows OS (OS_WIN)  saved_mode: %d\n", saved_mode);
         unsigned flag = (saved_mode <= 1) ? MODE_F1_MUSIC_UAC2 : MODE_F3_F4_FPS_UAC2;
@@ -2059,6 +2061,7 @@ void button_task(chanend c_hidSendData, chanend cc_mic_level, chanend c_uac_vol,
 #endif
 
 #if UAC1_MODE == 1
+                GET_SHARED_GLOBAL(host_os, g_host_os);
                 if (host_os == OS_WIN) {
                     unsigned flag = (saved_mode <= 1) ? MODE_F1_MUSIC_UAC2 : MODE_F3_F4_FPS_UAC2;
                     SetRoleSwitchFlag(flag);