diff --git a/BSP/u-boot/board/novatek/nvt-na51089/na51089evb.c b/BSP/u-boot/board/novatek/nvt-na51089/na51089evb.c
index beebcb829..1ae1041f4 100755
--- a/BSP/u-boot/board/novatek/nvt-na51089/na51089evb.c
+++ b/BSP/u-boot/board/novatek/nvt-na51089/na51089evb.c
@@ -155,7 +155,7 @@ static int nvt_handle_fw_abin(void)
 {
 	int ret = 0;
 	char cmdline[1024] = {0};
-	char buf[1024] = {0};
+	char buf[512] = {0};
 	int  ota_upgrade_sts = 0;
 	int is_ota = 0;
     if(WDT_OTA_GET_STS() == WDT_OTA_MAKEFOURCC(WDT_OTA_STS_LOADER_DETECTING_FW))
@@ -216,21 +216,27 @@ static int nvt_handle_fw_abin(void)
 		}
 	} else{
 		printf("%s%s:%d Update successfully %s\r\n", ANSI_COLOR_YELLOW, __FUNCTION__, __LINE__, ANSI_COLOR_RESET);
-		ota_upgrade_sts = 1;
 
 		if(is_ota)
 			WDT_OTA_SET_STS(WDT_OTA_STS_UBOOT_UPDATE_OK);
+		
+        ota_upgrade_sts = 1;
 	}
 	/*
 	 * To handle bootargs expanding for the kernel /proc/cmdline and uboot mtdids env setting
 	 */
-	sprintf(buf,"%s ",env_get("bootargs"));
+    //printf("%s:%d ota_upgrade_sts:%d\n", __FUNCTION__, __LINE__ ,ota_upgrade_sts);
+
+    snprintf(buf, sizeof(buf), env_get("bootargs"));
+	//sprintf(buf,"%s ",env_get("bootargs"));
+    //printf("%s:%d ota_upgrade_sts:%d\n", __FUNCTION__, __LINE__ ,ota_upgrade_sts);
+
 	strcat(cmdline, buf);
 	ret = nvt_part_config((char *)cmdline, NULL);
 	if (ret < 0)
 		return ret;
 
-	if (ota_upgrade_sts == 1) {
+	if (ota_upgrade_sts != 0) {
 		strcat(cmdline, "ota_flag=0x1");
 	}