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LucLagrandeur
User level: Level 1 (4 points)

How do I revert to a previous iOS version and restore lost data?

How to revert to the previous IOS. This new has deactivated all location services of all my apps; removed all the credit cards from the wallet... basically, I have lost everything.



[Re-Titled by Moderator]

Original Title: iOS 27.0.1 sucks

Posted on Oct 19, 2026 7:58 PM

2 replies

SravanKrA
User level: Level 10 (454,138 points)

Oct 20, 2026 2:43 AM in response to LucLagrandeur

The key point is that you can downgrade only to an iOS version that Apple is still signing.


So, if iOS 26.7 and iOS 27 are both currently being signed, you may be able to go from iOS 27 back to iOS 26.7. But if Apple has stopped signing iOS 26.7, you cannot downgrade to it—even if you still have the iOS 26.7 IPSW file.


Therefore, the limitation is not simply that you cannot go below 26.7. It depends on which versions Apple is currently signing. Once Apple stops signing an older version, installation of that version is normally blocked.


Regarding your data…

  1. If you have an iCloud or iTunes latest backup, then there is nothing to worry about. Just restore from it, else...
  2. If You have synced your data to iCloud, then what you will get back is what you have synced to iCloud and uploaded to iCloud Drive;
    1. The information that is synced and stored in iCloud, like Contacts, Calendars, Bookmarks, Mail*, Notes, Voice Memos, Messages*, shared photos, iCloud Photos*, Health data*, call history*, and files* you store in iCloud Drive.
    2. *-If you had turned on Messages in iCloud, iCloud Photos, Mail, Health data, call history under iCloud, and files you store in iCloud Drive your content is automatically stored in iCloud and is available on all devices that use the same Apple ID
  3. You have imported your Photos & Videos to Mac/PC then they are safely residing there on Mac/PC
  4. You have uploaded some of it to Cloud Drives using the Files app (iCloud Drive, Google Drive, OneDrive, DropBox, Flickr, box, AmazonDrive, Adobe Creative Cloud etc). The data remains there.
  5. If you have not backed up or do not have the latest backup, nor imported nor you have synced or uploaded your data to cloud drives prior to the situation that you are in, then I am sorry, all your data is lost.


lobsterghost1
User level: Level 10 (233,174 points)

Oct 19, 2026 8:12 PM in response to LucLagrandeur

You can't revert as downgrading has never been supported. Something clearly went wrong, but if iOS 27 did this, it would have done it to everyone and that certainly didn't happen. This forum would literally be blown up with people complaining, but it's not. The tech press would be all over this, but they're not.



Originally posted at discussions.apple.com/thread/256379307