Apple Stops Signing iOS 18.3.1 - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Stops Signing iOS 18.3.1

by

Apple today stopped signing iOS 18.3.1, so iPhone users who have upgraded to iOS 18.3.2 are no longer able to downgrade to the prior version of iOS 18. Apple released iOS 18.3.2 on March 10.

iOS 18
It is not unusual for Apple to stop signing older versions of iOS after releasing an update. Software that is not signed cannot be installed on an iPhone due to a server-side verification check, and it keeps iPhone users from installing outdated versions of iOS. iPhone models compatible with iOS 18 are only eligible to download and run iOS 18.3.2 at this time.

By preventing customers from installing older versions of iOS or downgrading, Apple ensures that devices have the latest security improvements.

iOS 18.3.2 introduced important security fixes, addressing a vulnerability that may have been actively exploited.

Popular Stories

iOS 27 Next to iPhone

Here's When iOS 27 Rolls Out Today in Every Time Zone [Update: It's Out]

Sunday September 13, 2026 3:00 am PDT by
Update 10:04 a.m.: iOS 27 is rolling out now, though it may take a bit for all users to see it, so keep checking! Apple is about to release iOS 27, which will finally deliver more advanced Siri AI capabilities as well as a variety of other refinements, improvements, and new features to iPhones. It's Apple's biggest software update of the year, and Apple announced at Wednesday's iPhone event...
Read Full Article • 152 comments
iOS 27 Icon iPhone

iOS 27 Available Now With These 8 New Features

Monday September 14, 2026 9:00 am PDT by
Update — 10 a.m. Pacific Time: Apple has released iOS 27. During its iPhone 18 Pro and iPhone Duo event last week, Apple announced that iOS 27 will be released widely on Monday, September 14. iOS 27 should be available around 10 a.m. Pacific Time / 1 p.m. Eastern Time today via the Settings app, under General → Software Update. Below, we have highlighted eight new features and...
Read Full Article • 111 comments
Apple iCloud Plus expansion hero

iCloud+ Now Includes Apple TV, Apple Arcade, and Curated Apple Music Stations in Over 100 Countries

Tuesday September 15, 2026 1:43 am PDT by
Apple today announced a new subscription initiative that turns paid iCloud+ subscriptions into a broader services bundle in more than 100 countries. In select countries, Apple says every paid iCloud+ plan, including the cheapest 50GB tier, now includes Apple TV and Apple Arcade "at no additional cost," while family sharing extends the storage, TV and Arcade access to up to five people....
Read Full Article • 109 comments

Top Rated Comments

M
mxrider88
20 months ago
It’s a good way to force users to use the latest bugs without chance to go back
Score: 7 Votes (Like | Disagree)
Reeneman Avatar
Reeneman
20 months ago

MR always does article when Apple stops signing an iOS version. Why? If MR article said Apple will stop signing tomorrow, for example., people could revert to last version.
They probably won’t know it 1 day before :)
Score: 3 Votes (Like | Disagree)
B
brucemr
20 months ago
MR always does article when Apple stops signing an iOS version. Why? If MR article said Apple will stop signing tomorrow, for example., people could revert to last version.
Score: 3 Votes (Like | Disagree)
Populus Avatar
Populus
20 months ago
Oh. Great. This morning I was planning to install 18.3.1 because the Mail App push feature doesn’t work on 18.3.2, and now Apple stops signing it? Damn… I guess they are forcing me to stay on the much less secure 18.0.1

Apple, could you stop this nonsense of releasing updates that introduce new bugs, break other features, and then blocking us from being able to downgrade to a version that worked better? This is getting a bit frustrating…
Score: 2 Votes (Like | Disagree)
FishyFish Avatar
FishyFish
20 months ago
I miss iOS 18.3.1. Good times, good times.
Score: 2 Votes (Like | Disagree)
Reeneman Avatar
Reeneman
20 months ago

YouTuber Aaron Zollo has said that when Apple stops signing an iOS version it means another is on the way very soon. The logic seems to be that Apple wants people to have at least one recent older version in case they have problems with the current one and want to step down to a previous version. With Apple not signing 18.3.1, there is no older version of iOS (at least, not of iOS 18). Zollo’s argument seems to be that 18.3.2 is about to become the older version that people can downgrade to if they have problems with an as-yet-to-be-released version.

It seems too soon for 18.4 to be that new version soon to be released to the public. So maybe 18.3.3?

What do y’all think? Does Zollo’s logic make sense? Have you noticed a pattern where a new iOS version comes out within days of a previous version no longer being signed?
No big science behind that.
New version is released for a reason: new features, bugfixes and most important: security fixes.
Give the people a couple of days to roll back to the old version when there are any huge issues.
Then stop signing the old version because people should not jump on the old version with most likely known security issues once again.
Score: 1 Votes (Like | Disagree)
Read All Comments