Can the iphone 4 be updated to 8.1 version?

Can the iphone 4 be updated to 8.1 version?

No.

Simple answer: NO
June 3, 2014: "Farewell iPhone 4: No iOS 8 upgrade for you"
http://www.zdnet.com/article/farewell-iphone-4-no-ios-8-upgrade-for-you/
" the oldest iPhone model to get iOS 8 will be the iPhone 4s (the oldest iPad will be the iPad 2)."

and anyway. Why would you want to?
It will add firmware (and therefore take up space) for features that do not exist in the iPhone 4… And just make it run slower.

and for a replacement. Becareful
iOS 11 is when all 32bit phones are dropped (so iPhone 5c plus Iphone 4 and before)
http://www.telegraph.co.uk/...et-ios-11/

https://9to5mac.com/...-apps-ios/

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