Apple Stops Signing iOS 16.3 Following iOS 16.3.1 Launch, Downgrading No Longer Possible

Following the launch of iOS 16.3.1 on February 13, Apple is no longer signing iOS 16.3, the previously available version of iOS. Now that Apple has stopped signing iOS 16.3, it is no longer possible to downgrade to that version of iOS after installing the iOS 16.3.1 update.

iOS 16
Apple routinely stops signing older versions of iOS after new releases come out in order to encourage customers to keep their operating systems up to date, so it is not unusual that the iOS 16.3 update is no longer being signed.

iOS 16.3 was a relatively minor update that introduced support for physical security keys for Apple IDs, expanded Advanced Data Protection globally, added support for the second-generation HomePod, and more.

While iOS 16.3.1 remains the current public version of iOS, Apple released the first beta of iOS 16.4 last week with support for new emoji characters, web push notifications, and more.

(Thanks, Aaron!)

Popular Stories

m1 chip slide

Five Years of Apple Silicon: M1 to M5 Performance Comparison

Monday November 10, 2025 1:08 pm PST by
Today marks the fifth anniversary of the Apple silicon chip that replaced Intel chips in Apple's Mac lineup. The first Apple silicon chip, the M1, was unveiled on November 10, 2020. The M1 debuted in the MacBook Air, Mac mini, and 13-inch MacBook Pro. The M1 chip was impressive when it launched, featuring the "world's fastest CPU core" and industry-leading performance per watt, and it's only ...
All Screen iPhone 2027 Feature 1

Apple to Hide Selfie Camera Under Display of 20th Anniversary iPhone

Monday November 10, 2025 1:55 am PST by
Apple will conceal the front-facing camera under the screen of its 2027 iPhone, a Chinese leaker said today, corroborating reports that Apple's 20th anniversary iPhone will have no visible cutouts in the display. Weibo-based account Digital Chat Station said Apple's development of under-screen camera technology was progressing as planned for adoption in 2027, one year after it will...
Early Black Friday Deals 1

The Best Early Black Friday Apple Deals on AirPods, Apple Watch, iPad, and More

Saturday November 8, 2025 6:16 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
2024 iPhone Boxes Feature

Apple Adjusts Trade-In Values for iPhones, iPads, Macs, and More

Thursday November 6, 2025 11:12 am PST by
Apple today updated its trade-in values for select iPhone, iPad, Mac, and Apple Watch models. Trade-ins can be completed on Apple's website, or at an Apple Store. The charts below provide an overview of Apple's current and previous trade-in values in the U.S., according to its website. Maximum values for most devices either decreased or saw no change, but the iPad Air received a slight bump. ...
iphone air thinness

iPhone Air Sales Are So Bad That Apple's Delaying the Next-Generation Version

Monday November 10, 2025 11:41 am PST by
The thin, light iPhone Air sold so poorly that Apple has decided to delay the launch of the next-generation iPhone Air that was scheduled to come out alongside the iPhone 18 Pro, reports The Information. Apple initially planned to release a new iPhone Air in fall 2026, but now that's not going to happen. Since the iPhone Air launched in September, there have been reports of poor sales...
Apple fitness plus feature

Future of Apple Fitness+ 'Under Review'

Sunday November 9, 2025 5:30 am PST by
The future of Apple Fitness+ is "under review" amid a reorganization of the service, according to Bloomberg's Mark Gurman. In the latest edition of his "Power On" newsletter, Gurman said that Apple Fitness+ remains one of the company's "weakest digital offerings." The service apparently suffers from high churn and little revenue. Nevertheless, Fitness+ has a small, loyal fanbase that...
Liquid Glass General Feature

Apple Shares Liquid Glass Design Gallery

Thursday November 6, 2025 2:45 pm PST by
Apple is promoting the new Liquid Glass design in iOS 26, showing off the ways that third-party developers are embracing the aesthetic in their apps. On its developer website, Apple is featuring a visual gallery that demonstrates how "teams of all sizes" are creating Liquid Glass experiences. The gallery features examples of Liquid Glass in apps for iPhone, iPad, Apple Watch, and Mac. Apple...
iOS 26

iOS 26.1 Available Now With These 8 New Features

Monday November 3, 2025 5:54 am PST by
Following more than a month of beta testing, Apple released iOS 26.1 on Monday, November 3. The update includes a handful of new features and changes, including the ability to adjust the look of Liquid Glass and more. Below, we outline iOS 26.1's key new features. Liquid Glass Toggle iOS 26.1 lets you choose your preferred look for Liquid Glass. In the Settings app, under Display...
iPhone Satellite Feature

Apple Developing These 5 New Satellite Features for iPhone

Sunday November 9, 2025 6:07 am PST by
Apple is working on a series of new satellite connectivity features for the iPhone, Bloomberg's Mark Gurman reports. In this week's "Power On" newsletter, Gurman revealed that the new features in development include: Apple Maps via satellite: Navigation in Apple Maps without cellular or Wi-Fi connectivity. Photos in Messages via satellite: Support for sending photos in the Messages...
iphone pocket%402x

Apple Debuts iPhone Pocket, a Limited Edition iPod Sock-Style Accessory

Tuesday November 11, 2025 1:23 am PST by
Apple has teamed up with Japanese fashion house ISSEY MIYAKE to launch iPhone Pocket, a 3D-knitted limited edition accessory designed to carry an iPhone, AirPods, and other everyday items. The accessory is like a stretchy pocket, not unlike an iPod Sock, but elongated to form a strap made of a ribbed, elastic textile that fully encloses an iPhone yet allows you to glimpse the display...

Top Rated Comments

fromgophonetoiphone Avatar
36 months ago

Makes no sense since 16.3.1 is hot garbage
It's fine for millions of users.
Score: 11 Votes (Like | Disagree)
fromgophonetoiphone Avatar
36 months ago

One death is a tragedy, one million deaths is a statistic.

If you're the one person affected by the bug introduced in the newest OS, the newest OS is hot garbage in your eyes.

I don't like how Apple refuses to allow downgrades, especially when their upgrade screws something up.
The issue is most people are horrendously bad at diagnosing complex issues. It's easy to blame 16.3.1 when it could be a whole host of issues. I worked on the Android ROM Development side of things and it was hilarious how people would blame bugs on nightly builds despite no commits in the past 48 hours. And then when there are commits, it's frequently translation updates only and all of a sudden you get battery posts about how the latest build makes a night and day difference.


* An update usually is accompanied by a reboot so all sorts of things can change even with a reboot (see this whole android ROM development scene story above... I suspect 99% of people seeing battery issues would see battery life change with a reboot whether or not they update their OS or not)
* 99% of blaming new builds never tries to revert to an older build to compare the difference. New York Times addresses this as confirmation bias ('https://www.nytimes.com/interactive/2015/07/03/upshot/a-quick-puzzle-to-test-your-problem-solving.html') which is a huge problem in almost all problem solving. Everyone likes to claim how they can "reproduce the bug," which is fine, but if you claim to know what causes the bug the you in theory can also turn off that bug. Most people, even some of the brightest engineers probably at Apple are capable of showing what causes the bug, but since it takes time to run a new experiment to see how you can turn OFF the bug, most people skip that and assume they have a solution (see NYT problem)
* People facing bugs typically blame the wrong thing (update) when you can likely reproduce their issues on another build as well.

I'm not trying to diminish anyone's problems with their devices, but I do feel that "latest version bug bias" is a real placebo effect.
Score: 7 Votes (Like | Disagree)
SFjohn Avatar
36 months ago
It was a security patch for an active vulnerability, it’s no wonder Apple has prevented reverting so soon! ??
Score: 6 Votes (Like | Disagree)
TheYayAreaLiving ?️ Avatar
36 months ago

That was quick, not even Apple wants people on 16.3 for a Kentucky minute!
At this point, I’m ready for iOS 17.
Score: 5 Votes (Like | Disagree)
Mousse Avatar
36 months ago

It's fine for millions of users.
One death is a tragedy, one million deaths is a statistic.

If you're the one person affected by the bug introduced in the newest OS, the newest OS is hot garbage in your eyes.

I don't like how Apple refuses to allow downgrades, especially when their upgrade screws something up.
Score: 5 Votes (Like | Disagree)
redbeard331 Avatar
36 months ago
That was quick, not even Apple wants people on 16.3 for a Kentucky minute!
Score: 3 Votes (Like | Disagree)