my iphone has been acting crazy whacky

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so i downloaded the ispw for it 17.1.1 and i have my mac mini with apple ocnfigurator

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i want to get the iphone into dfu mode and restore it

yes i know you can just restore it while connected but i want that super low level mode i want to be certain its restored from the lowest level possible ?

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i just cant seem to get it to that magical black screen ??

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does my iphone no longer support dfu mode ? im lost

because everytime i try button combos it just restarts

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i feel like this is the dumbest ? ever but i just cant figure it out i try the

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vol up

vol down

hold pwr - wait for black screen

never let go of power and then hold vol down 5 sec

let go of power but keep holdibg vol down

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doesnt work