Apple Stops Signing iOS 15.0 Following iOS 15.0.1 Release, Downgrading No Longer Possible

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.

iOS 15 General Feature Blue
Apple last week stopped signing iOS 14.8 as well, which means iOS 15.0.1 is the only publicly available version of iOS at this time, and those who have upgraded to iOS 15 cannot downgrade to iOS 14.

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 15.0 marks a major version update introducing Focus Mode, Live Text, on-device Siri, iCloud+, Safari changes, and tons more, with details available in our iOS 15 roundup.

iOS 15.0.1 introduced a fix for a bug that prevented an authenticated Apple Watch from being used to unlock an iPhone 13 model when wearing a face mask. It also addressed a bug that could cause the Settings app to incorrectly display a storage full alert and it fixed a bug with audio meditations for Fitness+ subscribers.

Related Forum: iOS 15

Top Rated Comments

i.am.apple.corporate Avatar
17 months ago
I am staying on iOS 14.8 until Apple provides more clarity on their CSAM feature rollout plans.
Score: 44 Votes (Like | Disagree)
nyuszika7h Avatar
17 months ago

I thought that Apple was going to be supporting iOS 14 with security updates for a period of time for users who did not move to iOS 15 right away? Is that not a thing anymore? (Users on 14.x below 14.8 now have nowhere to go except 15, if I am reading this right.)
No, users on iOS 14.5 and above can still update to iOS 14.8, because Apple introduced a new mechanism called AlternateSU (Alternate Software Update) that allows OTA updates to 14.8 but not restores in iTunes/Finder, therefore blocking downgrades while still keeping 14.x supported for users who are not ready to update. But this also means that if your phone bootloops, you have no other choice than to update to iOS 15.

On iOS 14.4.2 and below, you can only update to iOS 15 as the AlternateSU mechanism didn't exist yet (unless you use the delayed software updates feature meant for enterprise managed devices, which works in a very similar way only allowing upgrades and not downgrades: https://support.apple.com/guide/mdm/managing-software-updates-mdm02df57e2a/web)
Score: 22 Votes (Like | Disagree)
lkrupp Avatar
17 months ago

Is it safe to upgrade to 15 yet or should I keep waiting?
Wait forever if you want. You’ll get no straight answer from a tech blog. 50% will say it’s a dumpster fire and 50% will say it’s fine. You can’t believe either side. But know that no software will ever be perfect and free of bugs.
Score: 18 Votes (Like | Disagree)
zorinlynx Avatar
17 months ago

No, users on iOS 14.5 and above can still update to iOS 14.8, because Apple introduced a new mechanism called AlternateSU (Alternate Software Update) that allows OTA updates to 14.8 but not restores in iTunes/Finder, therefore blocking downgrades while still keeping 14.x supported for users who are not ready to update. But this also means that if your phone bootloops, you have no other choice than to update to iOS 15.

On iOS 14.4.2 and below, you can only update to iOS 15 as the AlternateSU mechanism didn't exist yet (unless you use the delayed software updates feature meant for enterprise managed devices, which works in a very similar way only allowing upgrades and not downgrades: https://support.apple.com/guide/mdm/managing-software-updates-mdm02df57e2a/web)
So the gist of this is that Apple will let you stay on iOS 14, will still supply security updates if you stay, but they really don't want you to. If they didn't mind people being on 14 they'd keep the last version of it signed.

This is disappointing because it means Apple's continuing support for iOS 14 will be half-arsed. They really should continue signing the last release of iOS 14 if they're still supporting it.
Score: 13 Votes (Like | Disagree)
antiprotest Avatar
17 months ago

I am staying on iOS 14.8 until Apple provides more clarity on their CSAM feature rollout plans.
My guess is that they have already made up their mind on CSAM. They will not listen to customers, or the security experts, or the inventors of this technology who called it "dangerous". The backlash is causing only a short delay. They will not cancel it. Perhaps after they've rolled out other features that are supposed to appear with iOS 15, the new macOS, rolled out some of the hardware that are supposed to come these months (MacBook etc), they will turn their attention back to this and flip the switch on CSAM. And soon they will not even update iOS 14 anymore. I don't think anything will change, except moving this to the back of the queue so the other things don't get derailed.
Score: 10 Votes (Like | Disagree)
legis_arvum Avatar
17 months ago
iOS 6 forever. The later trash sucks and is not needed.
Score: 9 Votes (Like | Disagree)

Popular Stories

iPhone trade in

Apple Adjusts Trade-In Values for iPhones, Macs, and More

Wednesday January 25, 2023 9:40 am PST by
After announcing new Mac and HomePod models last week, Apple adjusted its trade-in values for select devices in the United States. iPhone trade-in values decreased by up to $80, and most Android smartphones also went down. Mac trade-in values remained unchanged or increased by up to $40 depending on the model, while some Apple Watch models increased in value and others decreased. Trade-in...
iPhone 14 Pro Purple Side Perspective Feature Purple

iPhone 15 Pro Expected Later This Year With These 7 Exclusive Features

Tuesday January 24, 2023 4:53 pm PST by
Apple's next-generation iPhone 15 Pro and iPhone 15 Pro Max are expected to be announced in September as usual. Already, rumors suggest the devices will have at least seven exclusive features not available on the standard iPhone 15 and iPhone 15 Plus. An overview of the seven features rumored to be exclusive to iPhone 15 Pro models:A17 chip: iPhone 15 Pro models will be equipped with an A17...
Mac mini M2 2023

New 256GB Mac Mini and 512GB MacBook Pro Have Slower SSD Speeds Than Previous Models

Tuesday January 24, 2023 1:11 pm PST by
While the new Mac mini with the M2 chip has a lower $599 starting price, the base model with 256GB of storage has slower SSD read and write speeds compared to the previous-generation model with the M1 chip and 256GB of storage. A teardown of the new Mac mini shared by YouTube channel Brandon Geekabit reveals that the 256GB model is equipped with only a single 256GB storage chip, while the...
apple tv 4k red image

Apple Releases tvOS 16.3

Tuesday January 24, 2023 10:10 am PST by
Apple today released tvOS 16.3, the third major point update to the tvOS 16 operating system that originally came out in September. Available for the Apple TV 4K and Apple TV HD, tvOS 16.3 comes six weeks after tvOS 16.2, an update that added Apple Music Sing. The tvOS 16.3 update can be downloaded over the air through the Settings app on the ‌‌‌‌Apple TV‌‌‌‌ by going to System > Software...
watchOS 9 Feature

Apple Releases watchOS 9.3 With New Watch Face, Bug Fixes

Monday January 23, 2023 10:06 am PST by
Apple today released watchOS 9.3, the third major update to the watchOS 9 operating system that first launched in September. watchOS 9.3 comes over a month after watchOS 9.2, an update that added new Workout functionality and Crash Detection optimizations. watchOS 9.3 can be downloaded for free through the Apple Watch app on the iPhone by opening it up and going to General > Software Update. ...
iOS 16

iOS 16.3 for iPhone Launching Next Week With These 4 New Features

Friday January 20, 2023 11:43 am PST by
In a recent press release, Apple confirmed that iOS 16.3 will be released to the public next week. The software update will be available for the iPhone 8 and newer and includes a handful of new features, changes, and bug fixes. Below, we've recapped bigger features in iOS 16.3, including support for physical security keys as a two-factor authentication option for Apple ID accounts, worldwide ...
maxresdefault

Hands-On With the New M2 Pro Mac Mini

Tuesday January 24, 2023 1:45 pm PST by
The new M2-series MacBook Pro and Mac mini models launched today, marking the debut of the first M2 Pro and M2 Max chips. We have the M2 Pro Mac mini on hand, and thought we'd take a look at the machine and do a series of benchmarks to see how it fits into Apple's lineup. Subscribe to the MacRumors YouTube channel for more videos. Base model Mac mini machines come with either an M2 or M2 Pro...
Ventura Macs Feature Blue

Apple Releases macOS Ventura 13.2

Monday January 23, 2023 10:09 am PST by
Apple today released macOS Ventura 13.2, the second major update to the macOS Ventura operating system initially released in October. macOS Ventura 13.2 comes more than a month after macOS Ventura 13.1, an update that added the Freeform app and other changes. The ‌macOS Ventura‌ 13.2 update can be downloaded for free on all eligible Macs using the Software Update section of System...