Apple Stops Signing iOS 15.4.1 Following iOS 15.5 Release, Downgrading No Longer Possible

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.

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 15.4.1 is no longer being signed.

iOS 15.4.1 was a minor update that addressed an issue that could cause the iPhone's battery to drain more quickly following the iOS 15.4 launch. It also addressed an AppleAVD issue that could allow an application to execute arbitrary code with kernel privileges, which Apple said was actively exploited.

iOS 15.5 added an Apple Cash feature for requesting and sending money, along with new features for Podcasts and a fix for an issue with home automations. It also included several security updates, and those who have not already upgraded to iOS 15.5 should do so for that reason.

Popular Stories

New Things Your iPhone Can Do in iOS 18

10 New Things Your iPhone Can Do in iOS 18.2

Thursday October 31, 2024 9:42 am PDT by
Apple is set to release iOS 18.2 in December, bringing the second round of Apple Intelligence features to iPhone 15 Pro and iPhone 16 models. This update brings several major advancements to Apple's AI integration, including completely new image generation tools and a range of Visual Intelligence-based enhancements. There are a handful of new non-AI related feature controls incoming as well. ...
best early black friday deals

The Best Early Black Friday Apple Deals

Friday November 1, 2024 8:21 am PDT by
We're officially in the month of Black Friday, which will take place on Friday, November 29 in 2024. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment,...
M4 Pro on Blue

M4 Pro Chip Benchmark Results Reveal an Extremely Impressive Performance Feat

Thursday October 31, 2024 7:06 pm PDT by
The first Geekbench 6 benchmark results for the M4 Pro chip surfaced today. Impressively, the results that are available so far show that the highest-end M4 Pro chip is faster than the highest-end M2 Ultra chip in terms of peak multi-core CPU performance. Here is a comparison of the results: Mac mini with M4 Pro (14-core CPU): 22,094 multi-core score (average of 11 results) Mac Studio...
Apple iPhone SE 4 5G Modem 1

iPhone SE 4 First to Get Apple-Designed 5G Modem, iPhone 17 Pro to Add Custom Wi-Fi 7 Chip

Friday November 1, 2024 4:04 am PDT by
The iPhone SE 4 that's set to come out early next year is expected to debut Apple's first in-house 5G modem, according to Jeff Pu, an analyst who covers companies within Apple's supply chain. In a research note this week with Hong Kong-based investment firm Haitong International Securities, Pu said Apple is expected to roll out its custom-made 5G modem starting with the next-generation...
ios 18 2 chatgpt plus

iOS 18.2 Beta 2 Shows Siri ChatGPT Limit, Offers 'Plus' Upgrade Option

Monday November 4, 2024 10:54 am PST by
With the second beta of iOS 18.2 that's available for developers today, Apple has further fleshed out the ChatGPT integration that's available with Siri. In the Settings app, there's now a section that shows the ChatGPT daily limit, and offers an option to upgrade to the paid ChatGPT Plus plan. The beta includes an Advanced Capabilities section with a "Daily Limit" reading that shows up as...
M3 Pro Max vs M4 Pro Max Feature

Here's How Much Faster M4 Pro/Max Are for Graphics vs. M3 Pro/Max

Friday November 1, 2024 8:04 am PDT by
Apple's new M4 Pro and M4 Max chips are impressively fast in terms of CPU performance, topping the M2 Ultra, but what about graphics performance? The first Geekbench 6 results for GPU performance are now available for the M4 Pro and M4 Max, and the Metal scores reveal some impressive year-over-year gains. Based on the Metal scores that are available so far, the M4 Pro and M4 Max are up to...
imac video apple feature

What to Expect From Apple This November

Friday November 1, 2024 9:40 am PDT by
After a busy October in which Apple announced new Macs and Apple Intelligence launched, the calendar has now turned to November. Below, we outline what to expect from Apple this month as the slower-but-still-busy holiday season approaches. After seeding the first betas of iOS 18.2, iPadOS 18.2, and macOS Sequoia 15.2 with additional Apple Intelligence features last month, Apple will likely...

Top Rated Comments

jav6454 Avatar
32 months ago

15.5 seems to have been pretty good so far. They finally fix the gapless songs issue in 15.4. And so far, app load times seem a bit better now than 15.4/15.4.1, at least on my iPhone 7+. Feels like 15.5 is finally what 15GM should've been, and Apple finally fixed a lot of bugs.
Right now, we need Apple to place a pause to features in iPhoneOS 16. We need something like Snow Leopard was to OS X and trim down excess code, make it more efficient. Snow Leopard in that regard was highly effective and laid down the foundations for today's high efficiencies.
Score: 5 Votes (Like | Disagree)
emcampbe Avatar
32 months ago

Forcing pepole to upgrade to latest version and disallowing to downgrade if things get wrong is the thing EU should get into.
Forcing to upgrade?

How did they force you to upgrade? Turn off auto-updates and it won’t do that (hey, I’ve got it turned on and even so, I haven’t been prompted for 15.5).

Sure, eventually those older systems are incompatible, but they’re not forcing anyone to upgrade that I’m aware of.
Score: 4 Votes (Like | Disagree)
ian87w Avatar
32 months ago
15.5 seems to have been pretty good so far. They finally fix the gapless songs issue in 15.4. And so far, app load times seem a bit better now than 15.4/15.4.1, at least on my iPhone 7+. Feels like 15.5 is finally what 15GM should've been, and Apple finally fixed a lot of bugs.
Score: 4 Votes (Like | Disagree)
now i see it Avatar
32 months ago
Still on 14.8.1. Waiting for iOS 15 to be FINISHED
Score: 4 Votes (Like | Disagree)
ouruniverse06131986 Avatar
32 months ago

Still on 14.8.1. Waiting for iOS 15 to be FINISHED
Oh you mean iOS 16.
Score: 4 Votes (Like | Disagree)
duck apple Avatar
32 months ago
Forcing pepole to upgrade to latest version and disallowing to downgrade if things get wrong is the thing EU should get into.
Score: 3 Votes (Like | Disagree)