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i have an iPhone 4 but I’m wondering why the screws on the bottom are not pentlobe there just regular screws is this normal or added later

Hi as far I I know this could have been added later and it’s quite normal If you look on the 1st page of the is iFixit guide it says the same thing Here’s a link to the guide! iPhone 4 Battery Replacement Hopefully this helps Any questions please ask Thanks:-)