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New OS wants screen space and processing power that the old phone doesn't have.

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iPhone 4s - Wikipedia

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How to Get Better iPhone 4s Performance on iOS 8

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iOS 5 and iPhone 4S review roundup

Question] iphone 4s ios 8.4.1 wont stop booting to safe mode even after deleting the liable tweaks. pls help : r/LegacyJailbreak