Why iphone 4 can't install ios 8?

Why iphone 4 can't install ios 8?

It can only be installed on 4s, 5, 5c, and 5s. Basically so that anyone with 4th gen. Will buy a new phone giving them more money.

The iPhone 4 is too old.

Yes, it's all about making money.
Also, newer operating systems require better hardware, and they have to draw the line somewhere. If you must have iOS8, try selling your 4 and getting a 4S instead. You should probably first have a look whether it's going to slow down the 4S.

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