user18846: I'm using Arduino Uno R3 and the official Arduino WiFi Shield R3. I'm trying to update the Shield's firmware to 1.1.0 through this guide.
Everything goes fine until Step 9. When I execute the code in Step 10, I get an error (see attachment) as:
AtLibUsbDfu: 3EB 2FF8 no device present
FAIL Could not open USB device. 
ISP done.

EDIT: I re-installed the firmware on my shield and now the problem's gone.

user19559: I cant comment because of reputation... You've already upgraded the firmware. Just when you try upgrading again your wifi device is rebooting itself because of upgrading before.

user10200: Many of the online instructions do not work. This one does - http://arduinotronics.blogspot.com/2015/06/upgrading-arduino-wifi-shield-firmware.html

18846: <p>I'm using Arduino Uno R3 and the official Arduino WiFi Shield R3. I'm trying to update the Shield's firmware to 1.1.0 through <a href="http://www.bustatech.com/upgrade-arduino-wifi-shield/" rel="nofollow noreferrer"><strong><em>this</em></strong></a> guide.</p>

<p>Everything goes fine until Step 9. When I execute the code in Step 10, I get an error (see attachment) as:</p>

<p><code>AtLibUsbDfu: 3EB 2FF8 no device present</code></p>

<p><code>FAIL Could not open USB device.</code> </p>

<p><code>ISP done.</code></p>

<p><a href="https://i.stack.imgur.com/93FSy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/93FSy.png" alt="enter image description here"></a></p>

<p><strong><em>EDIT:</em></strong> I re-installed the firmware on my shield and now the problem's gone.</p>
 19559: <p>I cant comment because of reputation... You've already upgraded the firmware. Just when you try upgrading again your wifi device is rebooting itself because of upgrading before.</p>
 10200: <p>Many of the online instructions do not work. This one does - <a href="http://arduinotronics.blogspot.com/2015/06/upgrading-arduino-wifi-shield-firmware.html" rel="nofollow">http://arduinotronics.blogspot.com/2015/06/upgrading-arduino-wifi-shield-firmware.html</a></p>
