Impossible is nothing today. I have recovered a png before 2-3 years just no idea what was the software name. I know I was looking for days for it.
I'll look for it. Thanks. If you remember the software name please send it, any help would be really appreciated.
If jpg then it's impossible, because jpg don't save previous information on image. JPG just compresses RGB. And where you have hidden text, jpg has black-black-black bytes (but compressed).