Accidentally format iXpand New card But cannot recover the given files and folder inside!

Accidentally format iXpand New card ,because my
denon audio recorder must format first then recording. All files can be read by ipad and PC &Mac ,iXpand sync work fine and can play the wave file that had recorded too.
But whole thing inside before were erased,
Where can I find it download back or recover.
Cannot work with recovery program ,means not found any from recovered except the new writes files!

the iXpand does not need any specific folder layout. Just plug it into the computer and create whatever folder you want to. I have never see any download of the original folder structure.