Academy of Sciences of Heroesland

This is how one can become immortal.

Not quite. I was talking about an unplanned death, such as murder or death in an accident.

But if we develop the idea, we can come up with many things, including immortality. The point is that a person has a mortal body. If it could be updated without affecting the mind, then it would be possible to give him immortality. And this can be achieved with digital cloning - as the body wears out, a virtual copy of the patient's personality is created, which is then uploaded into an artificially created (or grown) body. Of course, the person will have to get used to it, but that's a matter of time. If it becomes possible to make a "backup" of the body, then a copy with excellent health can be made at the age of twenty-five, and then recreated after forty years using its digital copy. It will be the same person, only much younger.

And we should also consider that while the copy is in digital form, anything can be done with it, in particular, it can be edited. It is possible to remove or add certain personality traits, and perhaps it will be possible to eradicate some feeling, such as fear and the instinct for self-preservation (and then use such clones as a military force in artificial bodies). Of course, this will already be a different person, but what if someone wants to "photoshop" themselves - remove an unwanted personality trait, make themselves smarter, or something like that. A kind of mind makeover.
It is even possible to create a human personality from scratch for the purpose of exploitation. One example I gave above is a person without fear or self-preservation instinct, unconditionally obeying orders - an ideal soldier. This kind of artificial intelligence can also be used for any other purpose. It will be like a robot, only in a living body and with a much richer personality. Or a poor one, it depends on the goals and the program. But if the personality is greatly simplified, it will have little in common with a human one, and in fact, a creature with such a program can be considered a bio-robot. This is exactly one of those that we often see in science fiction films or books (the first thing that comes to mind is "I, Robot"). I just approached this artificial intelligence program from a different angle. And I probably acted illogically, because in any case, such robots will appear first, possibly not biological, but technical ones. And only then will they make copies of people's personalities and place them in biological shells, if they do.

Added 1 minute ago

This is the only way to make a "digital" clone (if possible). No more. Perhaps a clone with the memory of the original.
But to revive a real person in this way - I doubt it.

Why not? If programmed as I wrote, it is possible. But I'm afraid that this will not happen in the near future.