How do I Recover Forgotten Apple Account and iPhone Password?

My sister forgot the apple id password and has also forgotten the password of her iPhone.

she has an iPhone 15 pro, We still have the box of the phone with us. We have tried multiple ways but we are unable to get past that. Is there any way or method through which we can get the phone started? First preference is that all the data should be there , but if that’s not possible a clean reset is also acceptable.

Kindly anyone tell me a way or method through which a recovery is possible.

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