user19910: I just bought an Arduino Nano v3.0 (compatible? +- 5$) and I cannot connect it to my computer (Windows 8.1 64bit, Arduino IDE 1.6.8 installed).
The Arduino was bought as a clone but shows GRAVITECH.US on the front.
It has a FTDI FT232RL chip (1412-G B8908572) on the back.
When connecting the Arduino the power leds burns the TX and RX led flash a few times (really shortly) and then die. Then the yellow L leds blinks once per second continiously.(power to the Arduino comes from the USB cable, not from external power)
In the system tray I get a message saying 
"The last USB device you connected to this computer malfunctioned, 
and Windows does not recognize it."

In the device manager I get a node under Universal Serial Bus Controllers:
Unknown USB Device (Device Descriptor Request Failed).

When examining the properties of the device, the device-status is:
Windows has stopped this device because it has reported problems. (Code 43)
A request for the USB device descriptor failed.


I tried to reset the device 
I tried different USB cables
I used another Windows 8.1 PC without Arduino IDE installed
I used an old XP computer

All give same error.
I read about the bricking of clones by the recent FTDI drivers...
I downloaded the FT_Prog tool V3.0.60 to check the PID, but the tool simply does not find the Arduino...
I'm out of ideas... does anyone have some left?
Thanks in advance!
Michiel

user19910: I found the issue!
There is a bug in the Arduino hardware:
https://ketturi.kapsi.fi/2014/04/how-to-fix-moody-arduino-nano/
You need to bridge pins 25 and 26 of the FTDI chip (located at the back of the Arduino) to ground the pin 26 TEST signal.
If I connect these pins then it works just fine!

19910: <p>I just bought an Arduino Nano v3.0 (compatible? +- 5$) and I cannot connect it to my computer (Windows 8.1 64bit, Arduino IDE 1.6.8 installed).</p>

<p>The Arduino was bought as a clone but shows GRAVITECH.US on the front.
It has a FTDI FT232RL chip (1412-G B8908572) on the back.</p>

<p>When connecting the Arduino the power leds burns the TX and RX led flash a few times (really shortly) and then die. Then the yellow L leds blinks once per second continiously.(power to the Arduino comes from the USB cable, not from external power)</p>

<p>In the system tray I get a message saying </p>

<pre><code>"The last USB device you connected to this computer malfunctioned, 
and Windows does not recognize it."
</code></pre>

<p>In the device manager I get a node under Universal Serial Bus Controllers:</p>

<pre><code>Unknown USB Device (Device Descriptor Request Failed).
</code></pre>

<p>When examining the properties of the device, the device-status is:</p>

<pre><code>Windows has stopped this device because it has reported problems. (Code 43)
A request for the USB device descriptor failed.
</code></pre>

<ul>
<li>I tried to reset the device </li>
<li>I tried different USB cables</li>
<li>I used another Windows 8.1 PC without Arduino IDE installed</li>
<li>I used an old XP computer</li>
</ul>

<p>All give same error.</p>

<p>I read about the bricking of clones by the recent FTDI drivers...
I downloaded the FT_Prog tool V3.0.60 to check the PID, but the tool simply does not find the Arduino...</p>

<p>I'm out of ideas... does anyone have some left?</p>

<p>Thanks in advance!</p>

<p>Michiel</p>
 19910: <p>I found the issue!
There is a bug in the Arduino hardware:
<a href="https://ketturi.kapsi.fi/2014/04/how-to-fix-moody-arduino-nano/" rel="nofollow">https://ketturi.kapsi.fi/2014/04/how-to-fix-moody-arduino-nano/</a></p>

<p>You need to bridge pins 25 and 26 of the FTDI chip (located at the back of the Arduino) to ground the pin 26 TEST signal.
If I connect these pins then it works just fine!</p>
