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 Roundups: iOS 15, iPadOS 15
Related Forum: iOS 15

Top Rated Comments

i.am.apple.corporate Avatar
7 weeks 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
7 weeks 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
7 weeks 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
7 weeks 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
7 weeks 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
7 weeks ago
iOS 6 forever. The later trash sucks and is not needed.
Score: 9 Votes (Like | Disagree)

Related Stories

14

Apple Stops Signing iOS 14.7 Following iOS 14.7.1 Release

Monday August 2, 2021 6:42 pm PDT by
Following the release of iOS 14.7.1 last week, Apple has stopped signing iOS 14.7, the previously available version of iOS that was released earlier in July. With iOS 14.7 no longer being signed, it is not possible to downgrade to iOS 14.7 if you've already installed iOS 14.7.1. Apple routinely stops signing older versions of software updates after new releases come out in order to encourage ...
14

Apple Stops Signing iOS 14.6 Following iOS 14.7 Release

Monday July 26, 2021 3:00 pm PDT by
Following the release of iOS 14.7 last week, Apple has stopped signing iOS 14.6, the previously available version of iOS that was released in May. With iOS 14.6 no longer being signed, it is not possible to downgrade to iOS 14.6 if you've already installed iOS 14.7 or iOS 14.7.1. Apple routinely stops signing older versions of software updates after new releases come out in order to...
14

Apple Stops Signing iOS 14.5 Following Bug Fix iOS 14.5.1 Release

Monday May 10, 2021 12:36 pm PDT by
Following the release of iOS 14.5.1 last week, Apple has stopped signing iOS 14.5, the previously available version of iOS 14 that was released in late April. With iOS 14.5 no longer being signed, it is not possible to downgrade to iOS 14.5 if you've already installed iOS 14.5.1. Apple routinely stops signing older versions of software updates after new releases come out in order to...
iOS 14

Apple Stops Signing iOS 14.4 Following Release of iOS 14.4.1

Friday March 19, 2021 1:23 pm PDT by
Following the release of iOS 14.4.1 on March 8, Apple has stopped signing iOS 14.4, the previous version of iOS 14. With the software no longer being signed, it is no longer possible to downgrade from iOS 14.4.1 to iOS 14.4 if you've already upgraded your iPhone or iPad. Apple routinely stops signing older versions of software updates after new releases come out in order to encourage...
14

Apple Stops Signing iOS 14.3 Following iOS 14.4 Release

Tuesday February 2, 2021 4:36 pm PST by
Following the release of iOS 14.4 on January 26, Apple has stopped signing iOS 14.3, the prior version of iOS 14. With the software no longer being signed, it is not possible to downgrade from iOS 14.4 to iOS 14.3 if you've already upgraded. Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating...
iOS 14

Apple Stops Signing iOS 14.4.2 After Releasing iOS 14.5.1 With Fix for Actively Exploited Security Issues

Monday May 3, 2021 1:25 pm PDT by
Following today's release of iOS 14.5.1 and last week's release of iOS 14.5, Apple has stopped signing iOS 14.4.2, the previously available version of iOS 14 released on March 26. With iOS 14.4.2 no longer being signed, it is not possible to downgrade to iOS 14.4.2 from iOS 14.5 or iOS 14.5.1 if you've already updated your iPhone or iPad. Apple routinely stops signing older versions of...
iOS 14 on iPhone feature emergency

Even With iOS 15 Coming Soon, Apple Appears to Be Working on an iOS 14.8 Update

Monday August 9, 2021 6:52 am PDT by
Apple appears to be planning to release at least one more update to the iOS 14 operating system ahead of the launch of iOS 15, according to code spotted in Xcode. There are mentions of all of the released versions of iOS 14 in Xcode, along with a mention of iOS 14.8, which suggests that the new update could be coming in the near future, either ahead of or alongside iOS 15. Spotted in ...
iOS 14

Apple Stops Signing iOS 14.4.1 After Releasing iOS 14.4.2 With Fix for Actively Exploited Security Vulnerability

Friday April 2, 2021 12:40 pm PDT by
Following the release of iOS 14.4.2 on March 26, Apple has stopped signing iOS 14.4.1, the previously available version of iOS 14. With iOS 14.4.1 no longer being signed, it is not possible to downgrade to iOS 14.4.1 from iOS 14.4.2 if you've already updated your iPhone or iPad. Apple routinely stops signing older versions of software updates after new releases come out in order to encourage ...
iOS 15 General Feature Purple

Apple Releases iOS 15.0.1 With Fix for Apple Watch Unlocking Bug on iPhone 13 Models

Friday October 1, 2021 10:06 am PDT by
Apple today released iOS 15.0.1, which is the first official update to the iOS 15 operating system that was released in September. iOS 15.0.1 comes two weeks after the launch of iOS 15, and it is a bug fix update. The iOS 15.0.1 update can be downloaded for free and the software is available on all eligible devices over-the-air in the Settings app. To access the new software, go to Settings...
iOS 15 General Feature Red ORange

iOS 15 Suffering From Several Bugs as Adoption Rises to Nearly 20%

Thursday September 30, 2021 9:02 am PDT by
iOS 15 adoption has reached an estimated 19.3% since the software update was released September 20, according to mobile analytics company Mixpanel. Mixpanel measures iOS adoption based on visits to websites and apps that use its mobile analytics SDKs, so the data is not official. Apple has yet to share iOS 15 adoption stats, having last reported an 85% adoption rate for iOS 14 back in June. ...