I really don't know why you formatted your USB Drive or Pen Drive.
Though there are Data Recovery Softwares but now the possibilities are
really very low as your brother has already overwritten in the USB
drive. I don't think data recovery softwares can really help you
retrieve your formatted files and folders. The solution i have is
consulting the Data Recovery Experts who might help you solve your
problem. You can find a good Data Recovery Company searching from
Google. Consult them with details. One of the good Data Recovery
Company i have heard since 2001 is
www.eprovided.com who deals with
Data Recovery in every sort of Storage Devices like: SSD or HDD. I
think this company has a better solution for your critical data loss.
They have successfully served NASA so i think they can deal with
yours.
Regards.
Source:
www.eprovided.com