diff --git a/esp3d/src/core/esp3doutput.h b/esp3d/src/core/esp3doutput.h
index 8dc9e3c1..a40ab6db 100644
--- a/esp3d/src/core/esp3doutput.h
+++ b/esp3d/src/core/esp3doutput.h
@@ -82,7 +82,7 @@ public:
     }
     size_t dispatch (uint8_t * sbuf, size_t len);
     size_t printMSG(const char * s, bool withNL = true);
-    size_t printERROR(const char * s, int code_error = 200);
+    size_t printERROR(const char * s, int code_error = 500);
     size_t printLN(const char * s);
     void flush();
     int availableforwrite();
diff --git a/esp3d/src/core/espcmd/ESP401.cpp b/esp3d/src/core/espcmd/ESP401.cpp
index 350a264b..69fea6d5 100644
--- a/esp3d/src/core/espcmd/ESP401.cpp
+++ b/esp3d/src/core/espcmd/ESP401.cpp
@@ -166,9 +166,12 @@ bool Commands::ESP401(const char* cmd_params, level_authenticate_type auth_type,
 #endif //WIFI_FEATURE
     }
     if (!response) {
-        output->printERROR ("Incorrect command!");
+        String tmp = "error " + spos;
+        output->printERROR (tmp);
+
     } else {
-        output->printMSG("ok");
+        String tmp = "ok " + spos;
+        output->printMSG(tmp)
     }
 
     return response;
diff --git a/esp3d/src/core/espcmd/ESP420.cpp b/esp3d/src/core/espcmd/ESP420.cpp
index 28a2ff39..99c83cfa 100644
--- a/esp3d/src/core/espcmd/ESP420.cpp
+++ b/esp3d/src/core/espcmd/ESP420.cpp
@@ -708,7 +708,7 @@ bool Commands::ESP420(const char* cmd_params, level_authenticate_type auth_type,
             output->print ("/");
             output->print (WiFi.softAPmacAddress().c_str());
         } else {
-            output->print ("???");
+            output->print ("unknown");
         }
         if (!plain) {
             output->print ("\"}");
diff --git a/esp3d/src/include/version.h b/esp3d/src/include/version.h
index 8039c3ef..c1181931 100644
--- a/esp3d/src/include/version.h
+++ b/esp3d/src/include/version.h
@@ -22,7 +22,7 @@
 #define _VERSION_ESP3D_H
 
 //version and sources location
-#define FW_VERSION "3.0.0.a29"
+#define FW_VERSION "3.0.0.a30"
 #define REPOSITORY "https://github.com/luc-github/ESP3D"
 
 #endif //_VERSION_ESP3D_H