I've been using this board for a month, but trying a new software it got bricked.
When I try to upload a working project this is the result:

I readed about MCU boot utility, but when I try access to the board the USB is not found, and shows this error:

Then I put the board in Serial downloader and I can upload the firmware, but this is not working.
With the Serial downloader and MCU boot utility I have this message:

I need to unlock this to continue working. Does anyone knows what is happening?
Thank you in advance.