Apple Stops Signing iOS 17.5, Downgrading No Longer an Option

Apple today stopped signing iOS 17.5, preventing iPhone users from downgrading to that version of iOS. The update is no longer being signed after the May 20 release of iOS 17.5.1.

iOS 17
It is not unusual for Apple to stop signing an older version of iOS, and it typically happens a week or two after a new version of iOS comes out. When an update is no longer signed, it means it is no longer able to be installed on an ‌iPhone‌ per a server side software verification check.

Apple prevents users from installing older versions of iOS to encourage customers to keep their operating systems up to date with the latest security improvements.

iOS 17.5.1 addressed a corruption bug that could cause deleted photos to reappear on an iPhone. The update is now the only publicly released version of iOS available.

Popular Stories

iOS 26

iOS 26.2 Coming Soon With These 8 New Features on Your iPhone

Thursday December 11, 2025 8:49 am PST by
Apple seeded the second iOS 26.2 Release Candidate to developers earlier this week, meaning the update will be released to the general public very soon. Apple confirmed iOS 26.2 would be released in December, but it did not provide a specific date. We expect the update to be released by early next week. iOS 26.2 includes a handful of new features and changes on the iPhone, such as a new...
Google maps feaure

Google Maps Quietly Added This Long-Overdue Feature for Drivers

Wednesday December 10, 2025 2:52 am PST by
Google Maps on iOS quietly gained a new feature recently that automatically recognizes where you've parked your vehicle and saves the location for you. Announced on LinkedIn by Rio Akasaka, Google Maps' senior product manager, the new feature auto-detects your parked location even if you don't use the parking pin function, saves it for up to 48 hours, and then automatically removes it once...
AirPods Pro Firmware Feature

Apple Releases New Firmware for AirPods Pro 2 and AirPods Pro 3

Thursday December 11, 2025 11:28 am PST by
Apple today released new firmware designed for the AirPods Pro 3 and the prior-generation AirPods Pro 2. The AirPods Pro 3 firmware is 8B30, up from 8B25, while the AirPods Pro 2 firmware is 8B28, up from 8B21. There's no word on what's include in the updated firmware, but the AirPods Pro 2 and AirPods Pro 3 are getting expanded support for Live Translation in the European Union in iOS...
iOS 26

iOS 26.4 and iOS 27 Features Revealed in New Leak

Friday December 12, 2025 10:56 am PST by
Macworld's Filipe Espósito today revealed a handful of features that Apple is allegedly planning for iOS 26.4, iOS 27, and even iOS 28. The report said the features are referenced within the code for a leaked internal build of iOS 26 that is not meant to be seen by the public. However, it appears that Espósito and/or his sources managed to gain access to it, providing us with a sneak peek...
Foldable iPhone 2023 Feature 1

Apple to Make More Foldable iPhones Than Expected [Updated]

Tuesday December 9, 2025 9:59 am PST by
Apple has ordered 22 million OLED panels from Samsung Display for the first foldable iPhone, signaling a significantly larger production target than the display industry had previously anticipated, ET News reports. In the now-seemingly deleted report, ET News claimed that Samsung plans to mass-produce 11 million inward-folding OLED displays for Apple next year, as well as 11 million...
AirTag 2 Mock Feature

Apple AirTag 2: Four New Features Found in iOS 26 Code

Thursday December 11, 2025 10:31 am PST by
The AirTag 2 will include a handful of new features that will improve tracking capabilities, according to a new report from Macworld. The site says that it was able to access an internal build of iOS 26, which includes references to multiple unreleased products. Here's what's supposedly coming: An improved pairing process, though no details were provided. AirTag pairing is already...
iOS 26

Apple Releases iOS 26.2 With Alarms for Reminders, Lock Screen Changes, Enhanced Safety Alerts and More

Friday December 12, 2025 10:10 am PST by
Apple today released iOS 26.2, the second major update to the iOS 26 operating system that came out in September, iOS 26.2 comes a little over a month after iOS 26.1 launched. ‌iOS 26‌.2 is compatible with the ‌iPhone‌ 11 series and later, as well as the second-generation ‌iPhone‌ SE. The new software can be downloaded on eligible iPhones over-the-air by going to Settings >...
iOS 26

15 New Things Your iPhone Can Do in iOS 26.2

Friday December 5, 2025 9:40 am PST by
Apple is about to release iOS 26.2, the second major point update for iPhones since iOS 26 was rolled out in September, and there are at least 15 notable changes and improvements worth checking out. We've rounded them up below. Apple is expected to roll out iOS 26.2 to compatible devices sometime between December 8 and December 16. When the update drops, you can check Apple's servers for the ...
maxresdefault

iOS 26 Code Leak Reveals Apple Smart Home Hub Details

Thursday December 11, 2025 4:02 pm PST by
Apple is working on a smart home hub that will rely heavily on the more capable version of Siri that's coming next year. We've heard quite a bit about the hub over the last two years, but a recent iOS 26 code leak provides additional insight into what we can expect and confirms rumored features. Subscribe to the MacRumors YouTube channel for more videos. Macworld claims to have access to an ...

Top Rated Comments

lkrupp Avatar
20 months ago

I wanted to do the same, I figured they might un-sign it at any moment once they got back into the office from the long weekend so I installed it yesterday on a secondary device. Fortunately/unfortunately nothing seems to have happened so far.
Well then maybe you should believe Apple when they say the bug is extremely rare and affected a very small number of people. Why is it always Reddit that MacRumors gleans its reports from? I spend a lot of time on the Apple Support Communities forums and this issue was reported by maybe two or three users there. No big surge of outrage or hundreds of me-too posts like some issues, mostly crickets on this subject.

And then there’s the undisputed fact that the internet amplifies everything negative. All it takes is two or three people commiserating their similar issues to start the ball rolling, along with counting Google hits. Bingo, you have another -gate making the rounds.
Score: 2 Votes (Like | Disagree)
phenste Avatar
20 months ago
since nobody seems capable of saying it in a non-irritating way- good on Apple to stop signing this so quickly, the .1 update was more-than-necessary. glad they were able to provide a thorough explanation of what caused the bug and, most importantly, fix it in a relatively timely manner.
Score: 2 Votes (Like | Disagree)
Alp3r Avatar
20 months ago
I don’t understand why they stop signing certificates, what a insecure company.
Score: 1 Votes (Like | Disagree)
Populus Avatar
20 months ago
Wow, that was fast! I guess I won’t be able to test the resurrecting photos’ bug by myself…
Score: 1 Votes (Like | Disagree)
Samu25 Avatar
20 months ago
Good riddance! I doubt anyone would wanna downgrade to that disaster of an update!
Score: 1 Votes (Like | Disagree)
Paddle1 Avatar
20 months ago

Is 17.6 in the pipeline? What sort of things need to be addressed?
They should fix the voice message bug, though that probably doesn't call for a full 17.6.
Score: 1 Votes (Like | Disagree)