The next step is to simply purchase and download the most reliable data recovery software you can find
. This usually will get the job done, as it will scan the entire USB in search of the deleted files and work its way into retrieving those files. While losing data may make you want to pull out your hair, always remember that the worst case scenario (which is the latter) is best remedied by entrusting your broken USB to the experts so they can do the data recovery for you.