Arduino Nano - Unknown USB device 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
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!