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.
Related Stories
Following the release of iOS 15.4 on March 14, Apple has stopped signing iOS 15.3.1, the previously available version of iOS that came out in February. As iOS 15.3.1 is no longer being signed, it is not possible to downgrade to that version of iOS if you've updated to iOS 15.4.
Apple routinely stops signing older versions of software updates after new releases come out in order to encourage...
Following the May 16 launch of iOS 15.5, Apple has stopped signing iOS 15.4.1, the previously available version of iOS that came out in late March. Because iOS 15.4.1 is no longer being signed, it is not possible to downgrade to that version of iOS after installing iOS 15.5.
Apple routinely stops signing older versions of software updates after new releases come out in order to encourage...
Following the launch of iOS 15.6 last Wednesday, Apple has stopped signing iOS 15.5, the previously available version that came out in mid-May. Since iOS 15.5 is no longer being signed, it is not possible to downgrade to that version of iOS after installing iOS 15.6.
Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers...
Following the release of iOS 15.3.1 on February 10, Apple has stopped signing iOS 15.3, the previously available version of iOS that came out in late January. Because iOS 15.3 is no longer being signed, it is not possible to downgrade to that version of iOS if you've updated to iOS 15.3.1.
Apple routinely stops signing older versions of software updates after new releases come out in order...
Following the release of iOS 15.0.1 on October 1, Apple has stopped signing iOS 15.0, the previously available version of iOS that saw a public release on September 20. With iOS 15.0 no longer being signed, it is not possible to downgrade to that version if you've already updated to iOS 15.0.1.
Apple last week stopped signing iOS 14.8 as well, which means iOS 15.0.1 is the only publicly...
Following the release of iOS 15.2.1 earlier in January, Apple has stopped signing iOS 15.2, the previously available version of iOS that saw a public release on December 13. With iOS 15.2 no longer being signed, it is not possible to downgrade to that version if you've already updated to iOS 15.2.1.
Apple routinely stops signing older versions of software updates after new releases come out...
Apple is encouraging people who are still running iOS 14 to update to iOS 15, a reversal of an earlier policy that saw the company allowing iOS 14 users to choose not to install the iOS 15 update.
When iOS 15 launched, Apple said that iOS offered a "choice between two software update versions," pledging to offer security updates for those who opted to stick with iOS 14.iOS now offers a...
Last week, MacRumors shared news that Apple had stopped releasing iOS 14 security updates and was pushing those still on iOS 14 to upgrade to iOS 15, an apparent reversal of a promise to allow users to stay on the iOS 14 operating system.
Apple today told Ars Technica that the option to stay on iOS 14 and avoid the iOS 15 upgrade was always meant to be temporary. It is not a mistake that...
Popular Stories
Apple has "started to record" its virtual September event, where it's expected to announce the upcoming iPhone 14 lineup, the Apple Watch Series 8, and a new "rugged" Apple Watch model, according to Bloomberg's Mark Gurman. Writing in his latest Power On newsletter, Gurman says the event, which is expected to take place in the early part of September, is already under production, implying...
The standard 41mm and 45mm models of the Apple Watch Series 8 will feature the same design as the Apple Watch Series 7, according to Twitter user @ShrimpApplePro, who was first to reveal that iPhone 14 Pro models would feature a new pill-and-hole display.
Titanium will not be an option for the standard Apple Watch Series 8 models either, according to @ShrimpApplePro, but Bloomberg's Mark...
The iPhone 14 and iPhone 14 Pro models are rumored to be available in a refreshed range of color options, including an all-new purple color. Most expectations about the iPhone 14 lineup's color options come from an unverified post on Chinese social media site Weibo earlier this year.
Overall, the iPhone 14 and iPhone 14 Pro's selection of color options could look fairly similar to those of the ...
With the fifth beta of iOS 16, Apple has updated the battery icon on iPhones with Face ID to display the specific battery percentage rather than just a visual representation of battery level. The new battery indicator is available on iPhone 12 and iPhone 13 models, with the exception of the 5.4-inch iPhone 12/13 mini. It is also available on the iPhone X and the iPhone XS. Battery percent...
The camera bump on the upcoming iPhone 14 Pro Max is expected to be the largest rear lens housing Apple has ever installed on its flagship smartphones, and a new photo offers a rare glimpse at just how prominent it is compared to Apple's predecessor device.
iPhone 14 Pro Max dummy (left) vs iPhone 13 Pro Max All iPhone 14 models are expected to see upgrades to the Ultra Wide camera on the...
A new rumor claims that the next-generation 12.9-inch and 11-inch iPad Pro will feature a new four-pin Smart Connector, an update from the current three-pin connector in the iPad Pro.
The rumor from Mac Otakara, citing "reliable sources," says that the next iPad Pro, expected to debut possibly as soon as this fall, will feature a new Smart Connector that has four-pins rather than three. The...
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...