diff --git a/code/application/source/sf_app/code/source/storeMng/sf_storeMng.c b/code/application/source/sf_app/code/source/storeMng/sf_storeMng.c
index b106a27e9..4f90c6244 100644
--- a/code/application/source/sf_app/code/source/storeMng/sf_storeMng.c
+++ b/code/application/source/sf_app/code/source/storeMng/sf_storeMng.c
@@ -60,6 +60,11 @@ void sf_strg_dev_register(SINT32 dev_id, SINT32 mounted)
 
 MMC_DEV_TYPE sf_get_strg_dev(void)
 {
+    if(sf_strg_dev == NULL)
+    {
+        MLOGI("err\n");
+        return MMC_DEV_EMMC;
+    }
 	return sf_strg_dev->dev_type;
 }
 
diff --git a/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c b/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
index 90815ec55..159ee6714 100755
--- a/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
+++ b/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
@@ -430,8 +430,8 @@ S8 *appThumbKeyToName(thumbSize_t imgSize, thumbType_t fileType, UINT16 dirKey,
 		free(strg_path);
 		return SF_FAILURE;
 	}
-
-	char font =sf_get_strg_dev()  == MMC_DEV_EMMC ? 'B' : 'E';
+    MLOGI("s1\n");
+	char font =sf_get_strg_dev()  == MMC_DEV_EMMC ? 'B' : 'A';
 
     if(imgSize == THUMB_320x240)
     {
@@ -1142,7 +1142,7 @@ SINT32 sf_svr_packet_proc(SINT32 fd, UINT8  *pAppData, UINT16 dataLen)
 		free(strg_path);
 		return SF_FAILURE;
 	}
-
+    MLOGI("s1\n");
 	char *dcf_file = sf_get_strg_dev() == MMC_DEV_EMMC ? "SYBX" : "SYEX";
 	
     //printf("[sf_svr_packet_proc]dataLen: %d\n",dataLen);