Apple Stops Signing iOS 18.4

[MacRumors]

Apple is no longer signing iOS 18.4, a little over a week after releasing the iOS 18.4.1 update. Since iOS 18.4 is not signed anymore, iPhone users who have upgraded to iOS 18.4.1 are not able to downgrade to iOS 18.4.

It is not unusual for Apple to stop signing an older version of iOS after releasing an update, and the process keeps iPhone users from installing outdated versions of iOS. "Signing" refers to a server-side verification check that's done when versions of iOS are downloaded onto an iPhone. Only software that passes the verification check is able to be installed.

Preventing downgrading ensures that customers have the latest security improvements and are not vulnerable to known attacks or security holes.

The iOS 18.4.1 update addresses an issue with wireless CarPlay and fixes several security updates, including one known to be actively exploited, so it is a good idea to install the software if you have not done so already.

Article Link: Apple Stops Signing iOS 18.4

 

[winxmac]

Yes, I said it.

You have until 23 April 2025 to update/upgrade/downgrade to iOS 18.4 before it is no longer allowed.

 

[31 Flavas]

Yes, I said it.

I haven't followed patch drama in a while. Is there a reason why 18.4.1 is undesirable?

 

[CopiumWafu]

I haven't followed patch drama in a while. Is there a reason why 18.4.1 is undesirable?

Nope. No flips sides on this one.

 

[nunu10000]

I haven't followed patch drama in a while. Is there a reason why 18.4.1 is undesirable?

Some applications, are not yet compatible with/certified for 18.4.1.

Medical apps, which may have to go through multiple stages before testing, certifying, and releasing compatible updates are notorious.

For example, the Dexcom G7 only supports up to '18.4.0'

Dexcom G7 Compatible Phones and Smartwatches | Dexcom

Learn what phones, watches or other smart devices are compatible with Dexcom G7 CGM app. View a list of compatible phones including iPhone, Samsung, Google, Xiaomi and more.

www.dexcom.com

If you rely on a CGM app to tell you when your glucose is too high or too low, not allowing users to downgrade could be problematic.

 

[31 Flavas]

Some applications, are not yet compatible with/certified for 18.4.1.

Medical apps, which may have to go through multiple stages before testing, certifying, and releasing compatible updates are notorious.

For example, the Dexcom G7 only supports up to '18.4.0'

Dexcom G7 Compatible Phones and Smartwatches | Dexcom

Learn what phones, watches or other smart devices are compatible with Dexcom G7 CGM app. View a list of compatible phones including iPhone, Samsung, Google, Xiaomi and more.

www.dexcom.com

If you rely on a CGM app to tell you when your glucose is too high or too low, not allowing users to downgrade could be problematic.

Well - sure, but I'd hope there is some kind of MDM profile setup on said hospital devices.

Person I was responding to was referencing how they called the date that signing would be dropped. And, I was like ... why would someone, who has upgraded, want to know said date to roll back by - e.g. what drama is 18.4.1 causing that the technologically literate would want to roll back for?