My iphone 4 is on ios 7.1.2 how do i update it?

My friend has an iphone 4 and she's on ios 8 something and i just updates mine to 7.1.2 there's no udates available for it right now but there should be anyone have any idea what to do because i can't ownload loads of apps

Added (1). *download and please give helpful answers

If the update is not offered then your phone won't support it. The iphone 4 is limited to IOS 7.1.2. The iphone 4S can upgrade to IOS 9.3 so your friend must have an iPhone 4S

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