Leonardo not responding.

Hi. Search engine seems to be broken at this time so I can't make any research, so I'm sorry for this possible duplicated thread.
After uploading an unfortunate sketch my arduino (Leonardo) is not responding. I can't upload any sketches, can't reset it, windows shows it as an unknow device, load LED is constantly on. I tried to burn a new bootloader with USBasp but I also get a error message. Is there a thing that I can try to recover this board?
Thank You for Your time.

Looks like it is a common issue.

I posted here: http://forum.arduino.cc/index.php?topic=274370.0

and here: http://forum.arduino.cc/index.php?topic=224416.0

Kind of solution ("reset" during upload) is present. But I hope to find real solution for the issue.