Mini vu+ duo boot problem

Hi can anybody help me I am totally stuck. I have a mini vu+duo, it is stuck in stand by mode. I have tried flashing with usb, the usb is busy for about two minutes but nothing happens after reboot. if I press the control the light flashes on the box. I can hear the hard drive power up when the box is turned on, that and the red light. I have tried to do it via rs232 with vu util, I get to 80% then stops. I was able to connect to the box via Ethernet until I tried to flash it the first time with usb, I have tried three versions of vu util and a few different images. I just know what to try next.
Thanks

Hi rami, I know it is a clone. It was running with the latest black hole, it started of by sticking at the loading screen now it is stuck in stand-by. I can't get it to show on my network, would this be why I can't flash via vu util?