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: Leonardo not detected by computer [solved] - Installation & Troubleshooting - Arduino Forum
Kind of solution ("reset" during upload) is present. But I hope to find real solution for the issue.