How Can I Recover Files From My Usb Pen Drive That Insists It Must Be Formatted

I have some important files in my pen drive so, I dont want to format it. How could I open my pen drive without formatting it.

I have used recovery softwares to recover files and succeed to recover all of my files in my earlier normal formatting.

But I have heard that it is not possible to recover files by this type of formatting. Is it true? If so, what’s an alterantive?