Yii2: Failed creating own template with GII module (advance template)

Question

I have some problem here I have created an advance template with yii2, and i've followed "The Gii code generation tool" from http://www.yiiframework.com/doc-2.0/guide-gii.html

1. copy folder default template

   cp [YII_ROOT]\vendor\yiisoft\yii2-gii\generators\crud\default [YII_ROOT]\backend\generator\crud

2. edit [YII_ROOT]\backend\generator\crud\default\views\_form.php

       <?= "<?php " ?>$form = ActiveForm::begin(); ?>
       <?= "<?=" ?> $form->errorSummary($model) ?> <!-- ADDED HERE -->
   <?php foreach ($generator->getColumnNames() as $attribute) {
       if (in_array($attribute, $safeAttributes)) {
           echo "    <?= " . $generator->generateActiveField($attribute) . " ?>\n\n";
       }
   } ?>
   

3. edit [YII_ROOT]\backend\main.php

   return [
       'bootstrap' => ['gii'],
       'modules' => [ 'gii' => [
               'class' => 'yii\gii\Module',
               'generators' => [ //here
                   'crud' => [ //name generator
                       'class' => 'yii\gii\generators\crud\Generator', //class generator
                       'templates' => [ //setting for out templates
                           'myTemplate' => '@app\generator\crud\default', //name template => path to template
                       ]
                   ]
               ],
           ],
       ], ];
   

4. generate with gii (in this case generate CRUD)

The problem is, i still can't find the difference of _form.php template. what should i do?