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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Question marked as Top-ranking reply

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!

145 replies

Oct 4, 2025 7:56 AM in response to Jaysanja

Jaysanja wrote:

After upgraded ios 26, battery drain very fast. Need to recharge full 3 times in a day. Earlier it was only single charge for full day. Not expected from apple this kind of glitch.
apple should think about seriously and provide option for switch to last version.

Apple has NEVER supported downgrading, and it's HUGELY unlikely they ever will. But you're not telling Apple what you think they should do here. Use this link if you want to tell Apple --> Feedback - iPhone - Apple


Aug 12, 2025 12:40 PM in response to dinanja

dinanja wrote:

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


Unenroll Your Devices

ref: Apple Beta — Unenroll Your Devices


Revert and Restore Shipping Software:

ref: Apple Beta — Restore Shipping Software



note: The current stable release of iOS including bug fixes, security updates is iOS 18.6

Update your iPhone or iPad - Apple Support



Sep 17, 2025 5:09 AM in response to Hüseyin_88

If you are referring to the official version that was just released (NOT the beta version), then the answer is this - once you update, you cannot revert back to an older version. Apple does not support that.


Perhaps this link will help you better understand iOS 26. If you have specific questions about the features, please post them in a new thread so we may try to help.


What’s new in iPadOS 26 - Apple Support


Dec 9, 2025 2:40 PM in response to khloey290

khloey290 wrote:

I don’t like the iOS 26 update

Too bad. There are currently 139 messages in the 10 pages of this thread that you didn’t bother to read before posting, but if you had you would know everything there is to know about why you can’t downgrade. Or even if you read the Top Ranking reply at the top of every one of the 10 pages.

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

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