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How can i upgrade my iphone 4s device from version 9•3•5 to amuch bigger than this version kindly assist

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When downloading apps some keeps telling me to upgrade to version 11 to be able to download which when i try to upgrade it say it's upto date which makes me annoyed because i can't access the apps from apple store i want,also apple store app can't be downloaded coz the app version is bigger than my iphone 4S 9.3.5 version.i humbly need your customer care support and assistance

When downloading apps some keeps telling me to upgrade to version 11 to be able to download which when i try to upgrade it say it's upto date which makes me annoyed because i can't access the apps from apple store i want,also apple store app can't be downloaded coz the app version is bigger than my iphone 4S 9.3.5 version.i humbly need your customer care support and assistance

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The Firefox shell for iOS devices has required iOS 10.3 at minimum since Firefox 10.0 however to fully use some features you need iOS 11.0 at minimum.

https://www.mozilla.org/firefox/ios/12.0/system-requirements/ https://www.mozilla.org/firefox/ios/10.0/system-requirements/