How do I downgrade my iPhone from iOS 26 to iOS 18.5?

Ios 26 update downgrade to ios 18.5 ios 26 is not satisfactory 



[Re-Titled by Moderator]

Original Title: ios 26 downgrade to 18.5

Posted on Jun 18, 2025 10:47 PM

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Posted on Oct 14, 2025 2:12 PM

Unfortunately, you can’t downgrade an iPhone to iOS 18.5 once it’s been updated to iOS 26.

Apple only allows installing versions of iOS that are still being signed — and older versions like iOS 18.5 are no longer signed by Apple’s servers. That means even if you have an IPSW file, the installation will fail because the signature check won’t pass.

If iOS 26 feels unsatisfactory, the best thing you can do is:

  1. Submit feedback to Apple here: https://apple.com/feedback/ – this helps improve future releases.
  2. Check for upcoming updates under Settings › General › Software Update – Apple often fixes issues quickly with minor updates.
  3. Restore your iPhone via Finder or iTunes if you think something went wrong during the update. This can sometimes improve performance.

Once Apple stops signing iOS 26 and releases a new version (like iOS 26.1), you can only move forward, not back.


If you just want your phone to feel faster or more stable again, a clean restore from backup usually helps a lot!

155 replies

Sep 30, 2025 7:19 AM in response to needanswer19

needanswer19 wrote:

My iPhone has been updated to iOS 26.0.1, it has been so hard for me to use at 64 years old. I want to go back to the old system. I can't use a lot of the features.

I guess because I'm so much younger, it must be easier for me. I'm 63.


The whole "I'm too old to learn this new stuff" doesn't get you very far here. At 63, I'm one of the younger long-term members. We have people here who are well into their eighties, some of whom like iOS 26 just fine. Are there some who don't? Sure. But they don't blame their age for not liking something.


Are there people of all ages who don't like learning new things? Also true. But once again, that's a mindset, not an age.


Tell Apple what you'd like to see here:


Product Feedback - Apple


Oct 2, 2025 5:00 AM in response to vrobad

vrobad wrote:

I've updated around 2 weeks ago and my battery still dies much faster than on iOS 18, I have iPhone 15 pro max. So it's not about "indexing" unfotrunately, it's about new glass animations which eats battery and heats your iPhone as crazy. There are lots of youtube videos with real tests which demonstrate this.

If your last update was 2 weeks ago, then you have missed iOS 26.0.1. Update to that one where some have noted improvements in battery performance. There is also iOS 26.1 that is currently in beta, but we cannot comment on any issues that have been resolved. Waiting for that one to be officially released may also be beneficial for you.


Youtube videos become quickly out of date and no longer relevant after updates have been released. With iOS 26.0.1, it was just released 3 days ago, so consider anything before that time useless.

Oct 2, 2025 5:53 AM in response to vrobad

vrobad wrote:

I've updated around 2 weeks ago and my battery still dies much faster than on iOS 18, I have iPhone 15 pro max. So it's not about "indexing" unfotrunately, it's about new glass animations which eats battery and heats your iPhone as crazy. There are lots of youtube videos with real tests which demonstrate this.

There is also a youtube going viral which shows thatvthe glassy option uses less than the Reduce Transparency option. That is dubious too.

Nov 5, 2025 4:14 PM in response to mattedp

mattedp wrote:

First time in 18 years that the new iOS is worse, much worse than the previous version. This is alarming from Apple.

I like it and currently have it installed on 3 devices where there has not been any issues. While the new 26.1 update gives the option to use a Tinted UI instead of the full Liquid Glass, I prefer the Liquid Glass look. If you want to let Apple know how you feel, you can do that here:

Product Feedback - Apple


Dec 3, 2025 1:55 PM in response to azakcramed78

VeryHateIOS26 wrote:
Do you have a link about ios feedback?

For the Feedback, choose your device and then under Feedback Type, choose either Feature Request or Other and under Comments is where you explain the issue you would like to address. With iOS, the device would only be an iPhone so that is what you would want to choose. It does not ask you what iPhone you are using for feedback, just what iOS version you are using.

Dec 8, 2025 12:38 PM in response to IdrisSeabright

IdrisSeabright wrote:


modspa1 wrote:

I am so disappointed with this that I am going to drop Apple altogether, sell my Mavs and buy a new Android phone that actually works. iOS 26 is a disaster.
Because, as we all know, Android phones never have any issues. Their security is great, and they are updated every year, and everyone always loves the updates.

LOL. And I have a bridge in Brooklyn to sell you!

How do I downgrade my iPhone from iOS 26 to iOS 18.5?

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