Apple Stops Signing iOS 15.4 Following iOS 15.4.1 Release, Downgrading No Longer Possible - MacRumors
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Apple Stops Signing iOS 15.4 Following iOS 15.4.1 Release, Downgrading No Longer Possible

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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.

iOS 15
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 Forum: iOS 15

Top Rated Comments

Danfango Avatar
Danfango
53 months ago

Endless updates...more bugs...RedHat 8767092 2000
How dare they inconvenience the user by fixing stuff, protecting the user and improving the product that the user is complaining about!
Score: 8 Votes (Like | Disagree)
vanylapep Avatar
vanylapep
53 months ago
It's a trap.

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.
Score: 7 Votes (Like | Disagree)
B
b_link_22
52 months ago

How dare they inconvenience the user by fixing stuff, protecting the user and improving the product that the user is complaining about!
Seriously, when do they think this is? Pre-2020? Stop making things better Apple.
Score: 2 Votes (Like | Disagree)
S
_Spinn_
53 months ago
I'm glad Apple does what it can to stop OS fragmentation.
Score: 2 Votes (Like | Disagree)
orbital~debris Avatar
orbital~debris
53 months ago

It's a trap.

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.
Ah, so that was the subtext I missed when Admiral Ackbar said it!?
Score: 2 Votes (Like | Disagree)
L
leicaman
53 months ago
When the version that they stop signing has two zero day flaws, there's an inescapable reason to stop letting people downgrade to it.
Score: 2 Votes (Like | Disagree)
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