Apple Stops Signing iOS 16.3.1 to Prevent Downgrading

Following the release of iOS 16.4.1 today, Apple has stopped signing iOS 16.3.1, preventing iPhone users from downgrading to that software version. iOS 16.4, iOS 16.4.1, and the iOS 16.5 beta remain signed at the time of writing.

iOS 16
iOS 16.3.1 was released on February 13 and was a minor update with bug fixes, security improvements, and additional Crash Detection optimizations for iPhone 14 models. Apple routinely stops signing older iOS releases over time in order to prevent users from downgrading to an outdated software version.

iOS 16.4 will likely be unsigned later this month, so iPhone users who wish to downgrade to that version have limited time remaining to do so.

Related Forum: iOS 16

Popular Stories

Apple Creator Studio

Apple Introduces New 'Creator Studio' Bundle of Apps for $129 Per Year

Tuesday January 13, 2026 6:11 am PST by
Apple today introduced a new Apple Creator Studio bundle that offers access to six creative apps, as well as exclusive AI features and content, as part of a single subscription. In the U.S., pricing is set at $12.99 per month or $129 per year. Here are the six apps included with an Apple Creator Studio subscription:Final Cut Pro on the Mac and iPad Logic Pro on the Mac and iPad Pixelmator...
Low Cost MacBook Feature A18 Pro

Apple Is Expected to Launch These Four MacBooks in 2026

Friday January 9, 2026 8:17 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Subscribe to the MacRumors YouTube channel for more videos. ...
iOS 26

Here's What's New in iOS 26.3 So Far

Monday January 12, 2026 1:15 pm PST by
Apple today seeded the second beta of iOS 26.3, nearly a month after the first beta. So far, the update includes a couple of new features for iPhones. iOS 15.3 through iOS 18.3 were all released in late January over the years, so it is thereby likely that iOS 26.3 will be released towards the end of this month as well. The update is compatible with the iPhone 11 series and newer. Below,...
maxresdefault

Apple Confirms Google Gemini Will Power Next-Generation Siri This Year

Monday January 12, 2026 7:38 am PST by
In a statement shared with CNBC today, Apple confirmed that Google Gemini will power the next-generation version of Siri that is slated to launch later this year. Subscribe to the MacRumors YouTube channel for more videos. "After careful evaluation, we determined that Google's technology provides the most capable foundation for Apple Foundation Models and we're excited about the innovative...
Verizon New

Verizon is Down: iPhones Show 'SOS' Mode Due to Network Outage

Wednesday January 14, 2026 10:18 am PST by
Verizon is experiencing a major outage across the U.S. today, with hundreds of thousands of customers reporting issues with the network on the website Downdetector. There are also complaints across Reddit and other social media platforms. iPhone users and others with Verizon service are generally unable to make phone calls, send text messages, or use data over 5G or LTE due to the outage....
iPhone Top Left Hole Punch Face ID Feature Purple

10 Reasons to Wait for This Year's iPhone 18 Pro

Thursday January 8, 2026 2:56 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
fcp pcp iwork creator studio

Some Apple Apps Will No Longer Receive Every New Feature Without a Subscription

Tuesday January 13, 2026 10:50 am PST by
If you are not interested in subscribing to the new Apple Creator Studio bundle introduced today, you will officially start to miss out on some new features. Apple said some "exciting new intelligent features and premium content" in Pixelmator Pro, Keynote, Numbers, Pages, and Freeform will only be accessible with a Creator Studio subscription. In the U.S., a subscription costs $12.99 per...
airpods pro 3 design

Apple Releases New AirPods Pro 3 Firmware Update

Tuesday January 13, 2026 11:29 am PST by
Apple today released a firmware update for the AirPods Pro 3. The latest firmware has a version number of 8B34, up from the previous version 8B30. Apple has a support document for AirPods firmware updates, and it indicates that the 8B34 update contains unspecified "bug fixes and other improvements." No other AirPods models received firmware updates today. How to install AirPods Pro...
maxresdefault

Google Gemini-Powered Siri Will Reportedly Have These 7 New Features

Tuesday January 13, 2026 7:52 pm PST by
Apple and Google this week announced that Gemini will help power a more personalized Siri, and The Information has provided more details. Subscribe to the MacRumors YouTube channel for more videos. As soon as this spring, the report said the revamped version of Siri will be able to… Answer more factual/world knowledge questions in a conversational manner Tell more stories Provide...

Top Rated Comments

FeliApple Avatar
36 months ago
Apple’s most purposefully harmful (arguably a segment of planned obsolescence) policy ever. I reckon that it will never change, but I will never get tired of saying this.
Score: 13 Votes (Like | Disagree)
Carrotcruncher Avatar
36 months ago
This doesn’t bother me, because every software release lately is a downgrade, so you can downgrade any time you like, no matter what they do ???
Score: 11 Votes (Like | Disagree)
Solomani Avatar
36 months ago

iOS 16.4 will likely be unsigned later this month, so iPhone users who wish to downgrade to that version have limited time remaining to do so.
Why on earth would anyone who has already installed 16.4.1 want to downgrade to 16.4? The main point of 16.4.1 was to patch a jackalope exploit that was still not fixed in 16.4 ?‍♂️?‍♂️
Score: 10 Votes (Like | Disagree)
Paddle1 Avatar
36 months ago

Are they as harmful as they are on iOS though? That’s the important question, in my opinion.
The updates that nerfed the noise cancelling on the AirPods I'd argue were worse. You don't have a choice on whether to install.
Score: 8 Votes (Like | Disagree)
TheGenerous Avatar
36 months ago
When I was younger with no money I didn't care about jailbreaks and hacks. Now that my family and I will suffer immensely if I get malware or Russian ransomware, I rather stick to the latest versions if possible. Imagine your keychain and email in the hands of "the bad people". So, if it's time to upgrade your iPhone or iPad, then so be it
Score: 8 Votes (Like | Disagree)
eveluvsrainbows Avatar
36 months ago

(a) I disagree with the sentiment defending Apple deciding which version of software I can use on my device.
(b) Because I strongly prefer the way they look and work. They both largely do/did what I needed of them the way I wanted them to and whatever newer versions might have brought wasn’t worth the drawbacks. Applications I use continue to work just as they always have, no updates needed, and I can still run the current version of Chromium anyway.
it is absolutely your device, but it isn’t your software. it is apple’s; they own the intellectual property and source code to iOS - therefore they have the ability to say whether or not they will continue signing a specific iOS version or not. you may not agree with it, which is entirely fine, but it is within their rights and abilities to stop signing older versions of iOS if they so choose.

regarding macOS mavericks, absolutely - that is a solid macOS version. however i honestly can’t really agree with your implication that ios 6 was good - for the time it absolutely was. but ios has matured a lot since then, and is a much better mobile operating system now than it was back then.
Score: 5 Votes (Like | Disagree)