For example to clone USB sticks even onto different brand while retaining device serial numbers, vendor, product etc.
- https://nakedsecurity.sophos.com/2014/10/06/badusb-now-with-do-it-yourself-instructions/
- https://digfor.blogspot.com/2012/04/usb-flash-drive-serial-numbers-unique.html
Tools to reflash USB firmware and more importantly to change USB descriptor properties: