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If all he opened was the Hard Drive bay, then that shouldn't void the warranty.

https://www.playstation.com/en-gb/get-help/help-library/system---hardware/storage---data/upgrade-playstation-4-hdd/

If this is all you did in regards to which screws you took out, then you should be good.
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Capcom free since 2010! Still going strong!
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I hate my PS4. Its just a piece of shit.

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