How to change views exposed filter default value
in template.php:

function MY_THEME_form_views_exposed_form_alter(&amp;$form, &amp;$form_state) {
  // dpm($form);
  if ($form['#id'] == 'MY_EXPOSED_FORM_ID') {
    // Modifications go here.
    // example: (change the field name to yours)
    // $form['field_adv_cat_1_tid']['#default_value'] = 'All';
  }
}


then clear the cache.