I know that the flag.jpg file is a notepad capture, but I have no idea how to repair the hidden part.

The PNG file has been extracted, but no matter how many times I touch the file, it only appears as an empty notepad image. I think I've tried every method I can think of, such as checking all the CRC and removing unnecessary chunks, but it's not easy.. 😥 If you can help me with PNG file recovery, I would be grateful!