diff --git a/bbf_plugin/datamodel.c b/bbf_plugin/datamodel.c
index d983330..4a7560d 100644
--- a/bbf_plugin/datamodel.c
+++ b/bbf_plugin/datamodel.c
@@ -445,7 +445,12 @@ static int set_management_server_delay_reboot(char *refparam, struct dmctx *ctx,
 /*#Device.ManagementServer.ParameterKey!UCI:cwmp/acs,acs/ParameterKey*/
 static int get_management_server_key(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
 {
+	char buf[1024] = {0};
+
 	dmuci_get_option_value_string("cwmp", "cpe", "ParameterKey", value);
+	convert_hex_to_string(*value, buf, sizeof(buf));
+	*value = dmstrdup(buf);
+
 	return 0;
 }
 
diff --git a/src/common.c b/src/common.c
index 9e00532..753ba0d 100755
--- a/src/common.c
+++ b/src/common.c
@@ -363,9 +363,24 @@ size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
 	return written;
 }
 
+void convert_string_to_hex(const char *str, char *hex, size_t size)
+{
+	int i, len = CWMP_STRLEN(str);
+	unsigned pos = 0;
+
+	for (i = 0; i < len && pos < size - 2; i++) {
+		pos += snprintf((char *)hex + pos, size - pos, "%02X", str[i]);
+	}
+
+	hex[pos] = '\0';
+}
+
 void set_rpc_parameter_key(char *param_key)
 {
-	set_uci_path_value(NULL, "cwmp.cpe.ParameterKey", param_key ? param_key : "");
+	char buf[1024] = {0};
+
+	convert_string_to_hex(param_key, buf, sizeof(buf));
+	set_uci_path_value(NULL, "cwmp.cpe.ParameterKey", buf);
 }
 
 /*