Update message using old firmware

main.js

@@ -68,7 +68,7 @@ $(document).ready(function () {
             }
 
             if (CONFIGURATOR.connectionValidCliOnly) {
-                GUI.log('You need to <strong>Upgrade</strong> your firmware before you can view any of the tabs');
+                GUI.log('You need to <strong>upgrade</strong> your firmware before you can view any of the tabs. Use CLI for backup before flashing!');
                 return;
             }
 
@@ -330,4 +330,4 @@ String.prototype.format = function () {
     return this.replace(/\{(\d+)\}/g, function (t, i) {
         return args[i] !== void 0 ? args[i] : "{"+(i-args.length)+"}";
     });
-};
+};