Apple Stops Signing iOS 13.5.1 Following Release of iOS 13.6

Following the release of iOS 13.6 on July 15, Apple has stopped signing iOS 13.5.1, which means downgrading to that version of iOS is no longer possible.

iOS 13
iOS 13.5.1 was a security update that was released to address the vulnerability that allowed for the unc0ver jailbreaking tool that worked with many recent versions of iOS, including iOS 13.5.

Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date.

iOS 13.6, which introduced Car Keys, Apple News audio stories, and more, is the only current publicly available version of iOS that can be installed on iPhones and iPads. Apple has also seeded betas of upcoming iOS and iPadOS 14 updates to developers and public beta testers.

Popular Stories

iPhone 17 Pro 34ths Perspective

iPhone 17 Pro Launching Later This Year With These 10 New Features

Sunday March 23, 2025 10:00 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of March 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 ...
iOS 18

iOS 18.4 Expected Next Week - Here Are the Release Notes

Friday March 28, 2025 2:01 pm PDT by
With the second release candidate of iOS 18.4 that Apple seeded out today, the company finally provided us with release notes that give a full rundown on what to expect. There's an Apple Vision Pro app, new Apple Intelligence features for notifications and additional language support, plus an Apple News Food feature for Apple News+ subscribers, and several updates that should improve the...
Magic Mouse Green

What to Expect From the Magic Mouse 3

Saturday March 29, 2025 10:15 am PDT by
Apple is reportedly working on a new Magic Mouse. Below, we recap what to expect. The two key rumors for the Magic Mouse 3 so far include a relocated charging port, along with a more ergonomic design. It was briefly rumored that the Magic Mouse 3 would also feature voice control, but that was misinterpreted information. Relocated Charging Port While the Magic Mouse switched from...
top stories 2025 03 29

Top Stories: WWDC 2025 Announced, iPhone 17 Pro and iOS 19 Rumors, and More

Saturday March 29, 2025 6:00 am PDT by
Apple's big developer event is a little over two months away, and rumors about what we can expect to see in Apple's next major operating system updates are becoming increasingly frequent. A public release of iOS 18.4 is also imminent with a number of updates and improvements, although we won't be getting the major Apple Intelligence Siri upgrades that had reportedly been planned for this...
Foldable iPhone 2023 Feature Homescreen

Six Things to Know About Apple's Upcoming Foldable iPhone

Friday March 28, 2025 3:54 pm PDT by
We've been hearing rumors about a foldable iPhone for almost a decade now, but it looks like we might finally see the device come to fruition in 2026. We're going to be waiting many more months for the foldable iPhone, but so far we're hearing good things. Apple wants to make it creaseless. It's taken Apple multiple years to design a foldable iPhone that it's satisfied with because Apple ...
iOS 19 visionOS UI Elements

Apple Codename Provides Clue About iOS 19's Rumored New Design

Sunday March 30, 2025 6:40 am PDT by
Multiple sources have claimed that iOS 19 will introduce a new design with more translucent buttons, menus, notification banners, and more, and there is now another clue that points towards this glass-like appearance. Bloomberg's Mark Gurman today said the new design project is codenamed "Solarium" internally. A solarium is a room with glass walls that allow in plenty of sunlight, so this...
Facebook Feature

Facebook's New iPhone App Feature Turns the Clock Back to 2007

Thursday March 27, 2025 1:59 pm PDT by
In the mid-to-late 2000s, Facebook was all about staying connected with friends and family. However, as the social media platform added new features and grew over time, that core experience began to get drowned out. That changes starting now, according to Meta, which today introduced a new feature that will "bring back the joy" of classic Facebook. Specifically, Meta has redesigned the...
ipad pro 2024

Gurman: New iPad Pro and MacBook Pro Models With M5 Chips to Launch Later This Year

Sunday March 30, 2025 6:06 am PDT by
Apple's next-generation iPad Pro models with the M5 chip will "launch this year," according to Bloomberg's Mark Gurman. In his Power On newsletter today, Gurman said the new iPad Pro models have progressed to an "advanced testing" stage, and he expects mass production of the devices to begin in the second half of this year. If that timeframe is met, the new iPad Pro models could launch...

Top Rated Comments

BaltimoreMediaBlog Avatar
61 months ago
This is the one Apple practice that I most despise. This is what cost me 50+ 32 bit games apps that I then had to purchase all over again mostly or just forget them as some were never updated. I think this practice should be illegal in fact.

I had a battery replacement also that Apple made me pay for, but then shipped the phone back to me with an updated IOS that ruined 50+ apps.

This is just a horrible practice on so many levels.
Score: 9 Votes (Like | Disagree)
Westside guy Avatar
61 months ago

Who wish to go back to 13.5.1? I would have liked not to have ever updated: it ruined my iPad that was replaced by Apple being at the end of the 1st year of life
I'd like to go back to 10.3.3, personally. ?
Score: 6 Votes (Like | Disagree)
Apple_Robert Avatar
61 months ago

This is the one Apple practice that I most despise. This is what cost me 50+ 32 bit games apps that I then had to purchase all over again mostly or just forget them as some were never updated. I think this practice should be illegal in fact.

I had a battery replacement also that Apple made me pay for, but then shipped the phone back to me with an updated IOS that ruined 50+ apps.

This is just a horrible practice on so many levels.
Apple is trying to look out for people who don’t install updates that are often security based. If Apple didn’t do this kind of thing and numerous people got exploited, there would be a class action suit filed quicker than I can finish typing this post.

Apple is being pro active. And for many people, Apple is a bit too extreme.
Score: 3 Votes (Like | Disagree)
PickUrPoison Avatar
61 months ago

Fastest I have ever in my life hit 'Update'. 13.5.1 was a turd supreme. Don't even care what regressed.
I’m having more problems with 13.6 than I ever had with 13.5.1. News just sits there and spins before the “For You” section.

But my big issue is that the order of my Safari tabs keep shifting around—very frustrating because they’re mapped in my head and I expect to see tabs in a certain order. Even after I move them back to where they’re “supposed” to be, they won’t stay that way. They move back to within a few tabs of where they were before I moved them ?

As someone who has almost 400 open tabs, yeah, I’m frustrated. It’s screwing with my my finely honed system ?
Score: 2 Votes (Like | Disagree)
derbothaus Avatar
61 months ago
Fastest I have ever in my life hit 'Update'. 13.5.1 was a turd supreme. Don't even care what regressed.
Score: 2 Votes (Like | Disagree)
PickUrPoison Avatar
61 months ago

Almost 400? You’re kidding right?
Nope. And my 6s handles them beautifully ? iOS 13.6, not so much.




PS I have managed to pare it down a little over the last couple weeks...

https://forums.macrumors.com/threads/google-to-dramatically-improve-chrome-impact-on-mac-battery-life.2245544/post-28668481

Attachment Image
Score: 2 Votes (Like | Disagree)