Can the original file be recovered?

Yes, the original file can be recovered if you have a hard link to it. Since a hard link points to the same data on the disk as the original file, you can simply copy the hard link back to the original file name. For example:

cp hardlink.txt original.txt

This command will recreate the original file from the hard link. After executing this, the symbolic link will work again as it will point to the restored original file.