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 Apple routinely stops signing older iOS releases over time in order to prevent users from downgrading to an outdated software version.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

iPhone SE 4 Vertical Camera Feature

iPhone SE 4 Rumored to Use Same Rear Chassis as iPhone 16

Friday July 19, 2024 7:16 am PDT by
Apple will adopt the same rear chassis manufacturing process for the iPhone SE 4 that it is using for the upcoming standard iPhone 16, claims a new rumor coming out of China. According to the Weibo-based leaker "Fixed Focus Digital," the backplate manufacturing process for the iPhone SE 4 is "exactly the same" as the standard model in Apple's upcoming iPhone 16 lineup, which is expected to...
iPhone 16 Pro Sizes Feature

iPhone 16 Series Is Just Two Months Away: Everything We Know

Monday July 15, 2024 4:44 am PDT by
Apple typically releases its new iPhone series around mid-September, which means we are about two months out from the launch of the iPhone 16. Like the iPhone 15 series, this year's lineup is expected to stick with four models – iPhone 16, iPhone 16 Plus, iPhone 16 Pro, and iPhone 16 Pro Max – although there are plenty of design differences and new features to take into account. To bring ...
iphone 14 lineup

Cellebrite Unable to Unlock iPhones on iOS 17.4 or Later, Leak Reveals

Thursday July 18, 2024 4:18 am PDT by
Israel-based mobile forensics company Cellebrite is unable to unlock iPhones running iOS 17.4 or later, according to leaked documents verified by 404 Media. The documents provide a rare glimpse into the capabilities of the company's mobile forensics tools and highlight the ongoing security improvements in Apple's latest devices. The leaked "Cellebrite iOS Support Matrix" obtained by 404 Media...
tinypod apple watch

TinyPod Turns Your Apple Watch Into an iPod

Wednesday July 17, 2024 3:18 pm PDT by
If you have an old Apple Watch and you're not sure what to do with it, a new product called TinyPod might be the answer. Priced at $79, the TinyPod is a silicone case with a built-in scroll wheel that houses the Apple Watch chassis. When an Apple Watch is placed inside the TinyPod, the click wheel on the case is able to be used to scroll through the Apple Watch interface. The feature works...
bsod

Crowdstrike Says Global IT Outage Impacting Windows PCs, But Mac and Linux Hosts Not Affected

Friday July 19, 2024 3:12 am PDT by
A widespread system failure is currently affecting numerous Windows devices globally, causing critical boot failures across various industries, including banks, rail networks, airlines, retailers, broadcasters, healthcare, and many more sectors. The issue, manifesting as a Blue Screen of Death (BSOD), is preventing computers from starting up properly and forcing them into continuous recovery...
New MacBook Pros Launching Tomorrow With These 4 New Features 2

M5 MacBook Models to Use New Compact Camera Module in 2025

Wednesday July 17, 2024 2:58 am PDT by
Apple in 2025 will take on a new compact camera module (CCM) supplier for future MacBook models powered by its next-generation M5 chip, according to Apple analyst Ming-Chi Kuo. Writing in his latest investor note on unny-opticals-2025-business-momentum-to-benefit-509819818c2a">Medium, Kuo said Apple will turn to Sunny Optical for the CCM in its M5 MacBooks. The Chinese optical lens company...

Top Rated Comments

FeliApple Avatar
17 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
17 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
17 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
17 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
17 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)
Evelyn Harthbrooke Avatar
17 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)