Apple Stops Signing iOS 15.4 Following iOS 15.4.1 Release, Downgrading No Longer Possible
Following the March 31 release of iOS 15.4.1, Apple has stopped signing iOS 15.4, the previously available version of iOS that came out earlier in March. As iOS 15.4 is no longer being signed, it is not possible to downgrade to that version of iOS once you've installed iOS 15.4.1.

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, so it is not unusual that iOS 15.4 is no longer being signed.
iOS 15.4 was a major update featuring support for unlocking an iPhone while wearing a mask, new emoji characters, Universal Control on the iPad, and tons more.
iOS 15.4.1 added a fix for a battery drain issue on the iPhone, but more importantly, it addressed AppleAVD issue that could allow an application to execute arbitrary code with kernel privileges. Apple said this exploit may have been actively exploited, so it is a good idea to update to iOS 15.4.1 if you have not done so already.
Apple has also stopped signing tvOS 15.4 and HomePod 15.4 software.
Popular Stories
Apple's next device with an Apple silicon chip may not be a Mac or an iPad, but rather an advanced external display, according to recent reports.
The display, which is rumored to arrive this year, is expected to sit somewhere between the $1,599 Studio Display and the $4,999 Pro Display XDR – but more exact information about the device's positioning and price point is as yet unknown. While ...
Apple has previously announced several upcoming iOS features that are expected to be added to the iPhone this year. Some of the features could be introduced with iOS 16.4, which should enter beta testing soon, while others will arrive later in the year.
Below, we have recapped five new iOS features that are expected to launch in 2023, such as an Apple Pay Later financing option for purchases ...
Apple's VP of hardware engineering Matthew Costello and product marketing employee Alice Chan recently spoke with Men's Journal and TechCrunch about the new second-generation HomePod in wide-ranging interviews about the smart speaker.
Apple discontinued the original full-size HomePod in March 2021 after multiple reports indicated that sales of the speaker were lackluster, but Chan told Men's ...
Apple appears to be preparing an iOS 16.3.1 update for the iPhone, based on evidence of the software in our website's analytics logs this week. It's unclear when the update will be released, but it will likely be available at some point in February.
The same logs have accurately foreshadowed the release of several previous updates, including iOS 16.0.3 and iOS 16.1.1 most recently, so they...
AirTags may be a convenient way for tracking dogs that might get off leash or otherwise lost, but there are dangers associated with the practice, as outlined by a report from The Wall Street Journal.
At 1.26 inches in diameter, AirTags are able to fit easily on a dog's collar, but that size also makes the tracking devices small enough to swallow, at least for a medium to large-sized dog, and ...
When the original HomePod launched in 2018, it was discovered that the speaker can leave white rings on some wooden surfaces. Now, well-known YouTuber Marques Brownlee has confirmed that the issue persists to a lesser extent with the new HomePod.
In a side-by-side test, he showed that the white second-generation HomePod left a white ring on the wooden surface that he placed the speaker on,...
In June 2022, Apple previewed the next generation of CarPlay, promising deeper integration with vehicle functions like A/C and FM radio, support for multiple displays across the dashboard, personalization options, and more.
Apple says the first vehicles with support for the next-generation CarPlay experience will be announced in late 2023, with committed automakers including Acura, Audi,...
It's been more than a week since Apple released the iOS 16.3 update, and typically, new iOS betas follow launches within a day or so. We were expecting Apple to provide the first beta iOS 16.4 on Monday, Tuesday or Wednesday of this week, but that hasn't happened.
Tuesdays are the days that we most often see betas, though Monday and Wednesday happen now and then, and most often betas come...
Top Rated Comments
Once you update your phone to 15.4.1, Xcode 13.2.1 won't allow you to deploy to your phone because it only supports 15.4.0. So you update to Xcode 13.3 but your macOS won't allow it because you're on macOS 11.3 but Xcode 13.3 requires macOS 12.0. So you gota buy a new Macbook.
I took that as a warning sign and leave it be. The watchOS 8.5.1 update failed a couple times, but I just put my S3 next to my X before going to bed and updated the next morning.
So, things are going well otherwise. See you back here next year with iOS 16.
In the company I work at, I also receive email notification about needing to go to the latest version otherwise access to company resource will not work... I don't have a work-provided phone and I just decided to upgrade...
Also, note to Apple, re-sign the last update of previous versions so if someone cannot afford to buy a newer model, the device they currently have will still be at least useable although with limited app support...