How do I downgrade from iOS 27 to iOS 18 on iPhone?

Hello 👋

You cannot downgrade to iOS 18 because it's not signed anymore but you can downgrade to iOS 26 if you want by following the steps in this article : How to uninstall iOS or iPadOS beta software - Apple Support (CA)

After you restart your iPhone, if you used iCloud backups, make sure to setup your iPhone without using Quick Start (otherwise your backups from iOS 26 might not appear)

I hope this helps, that said, have a nice day 

Apple stopped signing iOS 18 years ago. For security reasons, you can only restore your iPhone to a version that Apple is currently signing, which right now is iOS 26. This has always been Apple's policy to protect user data, which is why it’s always best to think twice before jumping into a major upgrade.

Here are your best options right now:

• Downgrade to iOS 26: iOS 26 is incredibly stable and, honestly, runs much better than iOS 18 ever did. If you want to head back, here is a guide on how to uninstall the iOS beta: How to uninstall iOS or iPadOS beta software
• Stick with the iOS 27 Beta: Hang in there until the official iOS 27 public release. You'll get to enjoy all of Apple's latest and most advanced features first.
• Troubleshoot your current bugs: iOS has gotten much better at handling stability, and bugs are far less common now. Since updates roll out frequently, you can try fixing the issues causing you headache while waiting for the final release.

Other users have asked similar questions in the Apple Community before, so you might find this thread helpful: Can I revert from iOS beta to stable.

Moving forward, I'd highly recommend not installing beta software on your primary device. It's always best to weigh the pros and cons before upgrading!

[Edited by Moderator]

arol128 wrote:

I freaking installed iOS 27 and I can’t FREAKING DOWNGRADE TO IOS 18

[Re-Titled by Moderator]

Original Title: hi (:

You cannot under any condition downgrade to iOS 18. Read this for everything you need to know about removing the iOS Beta, but be advised if you did not make an archive backup before you downloaded the iOS Beta, you're out of luck --> To Beta or Not to Beta - That is the Ques… - Apple Community

You "freaking" made a mistake if you installed beta software on your primary device. The entire point of testing beta software is to uncover what doesn't work as expected and report it using the "Feedback Assistant" link you were provided when you joined the developer beta. If you're not a developer, why you did this makes no sense whatsoever.

malcom180 wrote:

I need to install IOS 27

If the most recent 14 versions of iOS (iOS 6 through 26) are any guide, the production version of iOS 27 will come out some time in September.

You would be well-advised to wait until then – as beta versions are likely to be full of bugs, may cause loss of data or loss of access to apps you rely upon, and should only be installed on spare phones.

To Beta or Not to Beta - That is the Question – Apple Community

To install iOS 27, you will need an iPhone that is compatible with it. A list of compatible iPhones is at the end of the OS - iOS 27 - Apple preview page. Apple Intelligence will only be available on some iPhones that run iOS 27 – see the list of compatible models, and the footnote about an enhanced Dictation feature, on the Apple Intelligence and Siri - Apple page.

Fateme73 wrote:

Yes, I want to revert my phone's iOS from 27 back to iOS 18. downgrade

You may want to do this, but you cannot do this.

You can't downgrade to iOS 18 or anything below that. You can only downgrade to iOS 26 right now.

57bn wrote:

eu quero votar meu iPhone 11 o iOS 18

Automated translation (from Portuguese): "I want to update my iPhone 11 to iOS 18."

If your iPhone 11 is running iOS 26, you cannot downgrade it to iOS 18. If you are running a beta version of iOS 27, your only options might be to remove the beta in favor of iOS 26 – or wait until iOS 27 is released and then update to the production version of iOS 27.

It's not possible to downgrade from iOS 27 to a lesser version. Sorry.

You are entitled to your opinion, but that won't change the fact that it is not possible to reinstall iOS 18 on your iPhone.

Itzz_r3han0 wrote:

I want to because it’s slow on iOS 27

You cannot.

I suggest that you force-restart your phone if you haven't done so since you updated.

ros264 wrote:

ios 18 downgrade

No.

You don't

AMSS6 wrote:

please can I downgrade iOS 18

No.

AMSS6 wrote:

iOS 27 is making this iPhone older

No, the passage of time is making the iPhone older.

And I think iOS 18 is better, so the phone can charge properly

You're certainly entitled to the opinion that iOS was better. But it won't change the fact that you can't go back to it. Also, there's nothing about iOS 27 that causes charging problems.

I can’t FREAKING DOWNGRADE TO IOS 18

You are correct.

You must have missed the important freaking part where Apple strongly advises to only install beta on a spare phone.