i want to install ios 8 to my iphone 4. how can i update

I'd say anything older than a 5s is out.

You could as mentioned get a Refurbished model from Apple, and pay for it in installments if your fixed budget allows for monthly payments for it.

Apple currently has refurbished iPhone 6s in Gold for $439. And you can get Special financing.

Apple Financing with Barclaycard Credit Card - Apple

Refurbished iPhone 6s 128GB - Gold - Apple

Beyond that if you plan on buying pre-owned for somewhere else, make sure the iPhone is actually unlocked, and can be used before handing over money.

Make sure the steps here were followed when buying second hand:

What to do before you sell or give away your iPhone, iPad, or iPod touch - Apple Support

Find someone who can read, have them review this thread, then have them give the answer to your question. After 52 pages in this thread, I don’t think we can offer anything that hasn’t already been said.

Thank you, Phil(?), lots of very useful links there and I really appreciated you taking the time to lay it all out for me; I guess the only thing I have to consider now is whether updates for an iPhone 5 will disappear up the funnel in a puff of white smoke, before — or after — I do ! ..... Cheers !

Not iPhone 5, MiddleDogWatch, iPhone 5s or higher. iPhone 5 cannot run iOS 11. If you could go for the iPhone 6 as Phil has laid out, you probably are going to see support and updates longer than if you go with an iPhone 5s. The older the device, the sooner it will fall off of the upgrade path.

Cheers,

GB

The iPhone 5 has already stopped receiving updates. It is unable to update to iOS 11.

As I said nothing older than a 5s. As Gail points out, preferably a 6 or newer to get at least a couple more years of support and updates.

Allan Eckert wrote:

Yes. Why they post such junk here I don't understand.

I think there's a point you can get early on for posting a picture. As to why they're so often sideways, that is a mystery to me.

sariffromdhaka wrote:

I want update my device into ios 8

Can you explain to me why you made that post? Did you read any of this thread before you posted? Did you read at least the "Apple Recommended" answer before posting?

It is amazing there are 57 pages in this thread, and the answer is contained in the very first reply. The first 4 replies are also marked Helpful or Apple Recommended, and provide ample detail to answer any the question. The simple act of opening this thread will show the correct answer without even having to scroll! When will people learn to read!!!!

I used to think the problem was with people searching in Google and just seeing the question. I just did a test search. You can easily see the answer. And, clicking on the link brings you to the first page of the thread, normal view.

If you search the forums, you're also brought to the first page with the marked answer.

I can think of no logical explanation for the repeated identical questions.

ChrisJ4203 wrote:

I can think of no logical explanation for the repeated identical questions.

I can provide an answer to that, but it wouldn't be politically correct. 😝

But it would probably be somewhat amusing. Seriously, though, I really want to understand this behavior. I don't think one even gets any of those beginner points for replying to a question. But, as the people who ask the question for the 89th time almost never come back, I'm fated not to know.

I am starting to think that those who make such posts don't have the foggiest idea why they are posting. It strikes me more like some of the replies I see in Facebook without any rhyme or reason to them.

Allan Eckert wrote:

I am starting to think that those who make such posts don't have the foggiest idea why they are posting. It strikes me more like some of the replies I see in Facebook without any rhyme or reason to them.

What benefit or pleasure can one derive from doing that? I honestly get the trolling posts. I don't approve but I understand. These.... nope.

I want to install ios 8 in iphone 4 ios 7.1.2

If only they would read the thread, it would save them from having to post here.

When pigs fly, I guess.... (eyeroll)

GB