title: How to load MobileSubstrate extension with root permission
body: <p>Below is contents of filter file.</p>
  
  <pre><code>&lt;plist version="1.0"&gt;
  &lt;dict&gt;
      &lt;key&gt;Filter&lt;/key&gt;
      &lt;dict&gt;
          &lt;key&gt;Executables&lt;/key&gt;
          &lt;array&gt;
              &lt;string&gt;installd&lt;/string&gt;
          &lt;/array&gt;
      &lt;/dict&gt;
      &lt;key&gt;SupportsRoot&lt;/key&gt;
      &lt;string&gt;1&lt;/string&gt;
  &lt;/dict&gt;
  &lt;/plist&gt;
  </code></pre>
  
  <p>The extension was loaded with mobile permission.</p>
  
  <p>How to load it with root permission?</p>