Some iPhone users who were unhappy with the latest software upgrade have filed a class-action lawsuit against Apple.
According to the lawsuit, the tech giant's iOS 9 software update made iPhone 4s phones slow, buggy and subject to crashes.
Apple promoted iOS 9 as being compatible with the iPhone 4s, making the phones faster and more responsive.
The suit is seeking $5 million in damages.
Apple has not commented.
Apple faces class-action lawsuit over iPhone software update
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