Apple Stops Signing iOS 18.0.1

Apple today stopped signing iOS 18.0.1, preventing iPhone users who have upgraded to iOS 18.1 from downgrading to iOS 18. Apple released iOS 18.1 a week ago on October 28.

Generic iOS 18
It is not unusual for Apple to stop signing older versions of iOS shortly after a new version of iOS is released. When Apple stops signing an update, it can no longer be installed on an ‌iPhone‌ due to a server-side software verification check that happens before new software is installed, so those who have upgraded to the latest version of ‌iOS 18‌ cannot downgrade to iOS 18.0.1.

Apple prevents downgrading to older versions of iOS to encourage ‌iPhone‌ users to keep their operating systems up to date with the latest security fixes.

The iOS 18.1 update added the first Apple Intelligence features, including Writing Tools, a new look for Siri, summaries and smart replies, and more. Apple CEO Tim Cook recently said that ‌iPhone‌ users are upgrading to iOS 18.1 twice as fast as iOS 17.1 during the same timeframe last year.

Popular Stories

iPhone 17 Pro Blue Feature Tighter Crop

iPhone 17 Pro Launching in Three Months With These 12 New Features

Saturday June 14, 2025 5:45 pm PDT by
The iPhone 17 Pro and iPhone 17 Pro Max are three months away, and there are plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of June 2025:Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone X through iPhone 14 Pro have a...
apple watch ultra 2 new black

Apple Watch Ultra 3 Finally Coming After Two-Year Hiatus

Monday June 16, 2025 8:45 am PDT by
Apple will finally deliver the Apple Watch Ultra 3 sometime this year, according to analyst Jeff Pu of GF Securities Hong Kong (via @jukanlosreve). The analyst expects both the Apple Watch Series 11 and Apple Watch Ultra 3 to arrive this year (likely alongside the new iPhone 17 lineup, if previous launches are anything to go by), according to his latest product roadmap shared with...
apple watch ultra snow

6 Features Coming to the Apple Watch Ultra 3

Tuesday February 25, 2025 9:00 am PST by
The Apple Watch Ultra 3 is expected to launch later this year, arriving two years after the previous model with a series of improvements. While no noticeable design changes are expected for the third generation since the company tends to stick with the same Apple Watch design through three generations before changing it, there are a series of internal upgrades on the way. By the time the ...
terminal macos tahoe

Apple's Terminal App Gets Colorful Redesign in macOS Tahoe

Monday June 16, 2025 4:12 am PDT by
Apple's Terminal app is getting a visual refresh in macOS Tahoe, and it's the first notable design update since the command-line tool debuted. The updated Terminal will support 24-bit color and Powerline fonts, according to Apple's State of the Platforms presentation at WWDC25. The app will also adopt the new Liquid Glass aesthetic with redesigned themes that align with macOS 26's broader...
iOS 26 on Three iPhones

Apple Says iOS 26 Won't Be Available on These iPhone Models

Tuesday June 10, 2025 6:58 am PDT by
Apple this week revealed that iOS 26 is compatible with the iPhone 11 series and newer. That means that iOS 18 is the end of the road for the iPhone XS, iPhone XS Max, and iPhone XR, which were all released in 2018. However, those devices will continue to receive security updates for at least a few more years. iOS 26 is compatible with the following iPhone models: iPhone 16e iPhone...
new iphone lockscreen ios 26

iOS 26: Five Changes Coming to Your iPhone Lock Screen

Tuesday June 17, 2025 8:46 am PDT by
With iOS 26, Apple has made some additions to the iPhone Lock Screen that aim to make it more customizable than ever. Of course, things can always change before the software makes its way to the general iPhone-owning public, but here are five new things iOS 26 can do on the Lock Screen as of the current developer beta. Widgets Top or Bottom In iOS 18, the row of widgets on your Lock...
iOS 18

Apple Releases iOS 18.6 Public Beta

Wednesday June 18, 2025 10:24 am PDT by
Apple today seeded the first betas of upcoming iOS 18.6 and iPadOS 18.6 updates to public beta testers, with the betas coming just a few days after Apple provided the betas to developers. Testers who have signed up for beta updates through Apple's beta site can download iOS 18.6 and iPadOS 18.6 from the Settings app on a compatible device by going to General > Software Update. When the...

Top Rated Comments

SebCohen Avatar
8 months ago
I THINK I’ll wait for 18.2…not that long anyway and I’ve already got ChatGPT+ and Siri is like my demented half sister who always shows up high on crack at the family reunions and can’t tell us how she got there.

Jokes aside, there’s not REALLY that much difference anyway. Not any meaningful day to day differences. It’s iOS 17 with a sprinkle of Android…so far. What I’m saying is, it doesn’t hurt the slightest to wait a month.
Score: 4 Votes (Like | Disagree)
O.N.Y.X Avatar
8 months ago

A pity. My “upgrade” to iOS 18 was a complete waste. RCS doesn’t work well and I don’t care about AI. I now have both turned off - and it’ll stay that way. What a disappointment.
Reading this, I’m super glad I decided not to „upgrade“ to iOS 18 months ago. With most of the features restricted to devices running U.S. English in the USA that upgrade would bring new bugs and likely make my iPhone 14 Pro a bit slower. So thanks but no thanks. 17.7 working fine here.
Score: 4 Votes (Like | Disagree)
frozencarbonite Avatar
8 months ago
As long as I can keep getting major security updates, I'm sticking with 17.7. I'd love to try 18.1, but it's not worth risking the irreversible problems it could cause.
Score: 2 Votes (Like | Disagree)
Populus Avatar
8 months ago
Good riddance (to 18.0.1, I mean).
Score: 1 Votes (Like | Disagree)
O.N.Y.X Avatar
8 months ago

Does this mean if you’re still on 17.6.1 and want to go to 17.7 or 17.7.1 you can’t? Ie it will only allow updates to 18.1? (AFAIK anything that supported 17 supports 18)
No, you can update iOS 17 to its latest version. If you upgrade to iOS 18.x you can’t go back anymore.
Score: 1 Votes (Like | Disagree)