I don't think there were any db changes.
But you should have used the 7.6.1.1 file first.
Any way your html includes may be gone which may be in the includes folde(header/footer)r as well as some styles which you may be able to just copy the files back from your backup..(the pointer is in the db, but still needs the file)
Then if you have custom islands they will be in the cachbuilders/custom folder.
Then if you have a gallery forum the will be in the gallery folder..
Some files would have been over written.
But some will not have been.
Anyway when you get it close make another backup of your files.
The posts should all be good they are in the db.
But another place to look is uploaded avatars and images for missing files.
Since I am not sure what you actually did to break the site.
