David Hanak Like a bolt from the blue, information appeared on the web that Apple allows downgrading from the operating system iOS 11 (and its various versions) to last year's iOS 10. This is so contrary to how it has worked until now. Shortly after the release of iOS 11, Apple made it impossible for users to go back to the previous version, saying that they stopped signing all versions of iOS 10. Many did not like this, because they could not try out the eleven and in case it caused them problems (which happened a lot), there was no way back. However, this is no longer the case, and if it is not a mistake that will be fixed in the next few hours, downgrading from iOS 11 to iOS 10 is now possible.
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Dan Pražák At the time of writing, according to the server ipsw.me to see which versions of iOS Apple currently signs, i.e. which can be officially installed on an iPhone or iPad. In addition to the three versions of iOS 11 (11.2, 11.2.1 and 11.2.2), there is also iOS 10.2, iOS 10.2.1 and iOS 10.3. The installation files are available at the website linked above. Here you just choose the type of device you want to downgrade to, choose the version of the software you want to download and install it using iTunes.
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Thanks to this step, those who are not satisfied with the new operating system for some reason can return to a version of iOS 10. Apple signs older versions of iOS for all iPhones since the iPhone 5. It is not yet clear if this is a permanent solution or if it is more of a bug on Apple's part. So if iOS 11 doesn't suit you and you want to go back, you have a unique opportunity to do it now (if it's really a bug that Apple will fix in the next few minutes/hours). Interestingly, it is currently possible to officially revert to even older versions of iOS, such as iOS 6.1.3 or iOS 7. However, this itself indicates that this is a mistake.
Update: Currently everything is fixed, downgrade is no longer possible.
Source: 9to5mac
So theoretically I can go back to the original ios 4 on my iphone 9.3.5s with ios I think 5?
ps Which ios was the most successful on the 4s?
The best iOS for 4S was iOS 6.
I downloaded the files for IPHONE 4 (ios 5) and IPAD 4 (ios 6), but I probably won't do anything with them now, right? when Apple fixed it
Exactly.
I think you can install it. Follow the jailbreak instructions, but install the official old one instead of the jailbroken iOS. Apple just doesn't "sign" it. It should probably be functional. Back it up beforehand, and when it becomes potent, you can install the latest signed one again. And then restore from backup. But I haven't tried it. I do not guarantee anything. And for myself, I recommend installing exclusively according to the information from Apple.
Well, she must have been unlucky :-).
It's a shame that it was not possible to go back to ios 9.3.5, which I still have luckily, it would be useful for my friends...Apple could make more such "mistakes".
I'm going to downgrade from 11.2.2 right now, my IP 7 is crashing the most, my friend and I got it "recommended to all users"
I don't really like how this article encourages readers unhappy with iOS 11 to install something it admits may be available due to some Apple bug. With such a procedure, users could be in for a nasty mess in the event of an actual Apple error.
The article's recommendation should have been more like: "Wait to see if Apple will let it go and confirm, and then install if necessary."