Accidently deleted all files on internal storage and synced new files to internal storage

Question

Hi
I was setting up FolderSync to sync some folders to my phones internal storage. My mistake was to choose the root of the internal storage, which deleted all files files and synced the folders to the internal storage. I've tried to factory reset the phone, to recreate folders and files originally placed on the internal storage, but no luck. I've only used the phone a couple of days, and didn't wanna spend time on trying to recover folders/files, since I guessed that syncinf files to internal storage would damage the "old" files anyway. Is it possible to recreate the internal storage to the state when I first used the phone? For example the demo videos and sample pictures don't reappear when I do a factory reset (also placing the tick for deleting the internal storage).
Br
Frank
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Answer 1

After doing full factory reset your phone will be clean and ready to use with root folder recreated. But... demo videos and sample pictures are not part of firmware. It is region dependent content available only until phone is factory cleaned or user deletes them.
So to recover those files you need to find other user with the same phone as yours and kindly ask him to share those files with you (if sharing such files is legal in your country).
Best regards,
Sergio PL
Xperia Z1 / Nexus 7 (2012)