To recover deleted files from a flash drive follow this procedure:
You can recover files from a USB drive at no cost by downloading and using Disk Drill for Windows. The application offers a simple and effective means of restoring deleted files from USB drives or any other type of storage media. Recover up to 500 MB of data for free before upgrading to the Pro version of this data recovery tool.
To recover data from a formatted flash drive use these steps:
Without software you can try to recover deleted flash drive files with this process:
11 Best USB Flash Drive Recovery Tools: