How to Downgrade iOS 27 to iOS 26
Downgrading from iOS 27 to iOS 26 requires a full IPSW restore — there is no setting or button that rolls back your iOS version. The process erases your iPhone and installs the older firmware. Whether this is possible at all depends on one critical factor: whether iOS 26 is still being signed by Apple at the time you attempt it.
Direct Answer: To downgrade from iOS 27 to iOS 26, you need the iOS 26 IPSW file for your device and an active signing window. Download the correct IPSW from IPSW.io, back up your iPhone, connect it to your Mac or PC, hold Option (Mac) or Shift (Windows) and click Restore iPhone in Finder or Apple Devices, then select the iOS 26 IPSW. This erases the device completely.
Before You Begin — Check If iOS 26 Is Still Signed
Apple controls which iOS versions can be installed through a signing window. Once Apple stops signing a version, the restore process fails — even if you have the IPSW file. You must act before the signing window closes.
Typical signing window timeline:
- Apple usually keeps signing the previous major iOS version for 2–4 weeks after the new major release ships
- Once iOS 27 releases publicly (expected September 2026), Apple will begin closing iOS 26 signing within weeks
- Individual iOS 26 point releases (iOS 26.1, 26.2, etc.) close signing faster — usually days after the next point release
Check current signing status for iOS 26 before doing anything else: go to IPSW.io's iPhone firmware page, select your device, and look for the signed/unsigned indicator next to each build. For live iOS 27 signing status, see iOS 27 IPSW Signing Status — What's Signed Now.
What You Need
- A Mac or Windows PC
- Finder (Mac, macOS Catalina or later) or Apple Devices / iTunes (Windows)
- A Lightning or USB-C cable (matching your iPhone model)
- The correct iOS 26 IPSW file for your exact device model (from IPSW.io)
- An iCloud or local backup made before you start
- At least 10 GB of free space on your Mac or PC for the IPSW file and restore process
- Confirmation that iOS 26 is currently signed for your device
Step-by-Step: Downgrade iOS 27 to iOS 26
- Back up your iPhone. Go to Settings → [Your Name] → iCloud → iCloud Backup → Back Up Now. Alternatively, back up to your Mac or PC using Finder or Apple Devices. The restore will erase everything — this backup is your only way to recover your data.
- Download the iOS 26 IPSW for your device. Go to IPSW.io's iPhone firmware page, select your device model, and download the iOS 26 build that is currently signed. Confirm the signed indicator is active before downloading.
- Disable Find My iPhone. Go to Settings → [Your Name] → Find My → Find My iPhone and turn it off. You will be prompted for your Apple Account password. The restore will fail if Find My is still enabled.
- Connect your iPhone to your Mac or PC. Use the cable that came with your device. Trust the connection on the iPhone if prompted.
- Open Finder (Mac) or Apple Devices / iTunes (Windows). Select your iPhone in the sidebar.
- Hold Option (Mac) or Shift (Windows) and click Restore iPhone. This opens a file picker instead of downloading the latest iOS automatically.
- Select the iOS 26 IPSW file you downloaded in step 2.
- Confirm the restore. Read the warning — this erases the device. Click Restore when you are ready. The process takes 10–20 minutes.
- Set up your iPhone. After the restore, your iPhone will be running iOS 26. Use the setup screen to restore from your backup.
If the Restore Fails
"The iPhone could not be restored. This device isn't eligible for the requested build."
iOS 26 is no longer signed for your device. Apple has closed the signing window and the downgrade is no longer possible. Your only option at this point is to install the latest signed iOS 27 build.
"The iPhone software update server could not be contacted."
A network issue is preventing Apple's servers from verifying the build signature. Check your internet connection, temporarily disable your firewall or VPN, and try again.
The restore gets stuck on the Apple logo.
The restore may have stalled. Disconnect, put your iPhone in DFU mode, reconnect, and start the restore again. See iPhone Boot Loop Fix: Recover Without Losing Data for DFU mode instructions.
Finder/Apple Devices is not recognizing my iPhone.
Try a different cable, a different USB port, and restart both your iPhone and your Mac/PC. If still not recognized, check that you have the latest version of Finder or Apple Devices installed.
What Happens to Your Apps and Data
The downgrade restore erases everything on the device. After the restore, you will be on iOS 26 with no data. Restoring from your backup (step 9) brings back your apps and data, but note:
- Apps that required iOS 27 features may not function correctly on iOS 26
- Data from apps that stored iOS 27-specific data may not restore cleanly
- Your Apple Account and settings restore normally
The Faster Alternative: Wait for iOS 27 to Improve
If you are downgrading because of a bug or performance issue, consider whether the issue might be fixed in the next iOS 27 beta. Beta bugs are often resolved within 2–4 weeks. For help diagnosing iOS 27 update problems, see iOS 27 Update Failed or Stuck — How to Fix It.
For a comparison of what changed between versions, see iOS 27 vs iOS 26 — Should You Update?.
FAQ
Can I downgrade from iOS 27 to iOS 26 without losing data?
Not directly. The restore process erases your device. You can restore from a backup taken before the iOS 27 update, but any data created after that backup will be lost.
How do I know if iOS 26 is still signed?
Check the signing status on the IPSW.io iPhone firmware page. Select your device, find the iOS 26 build, and look for the signed indicator. If it shows unsigned, the downgrade window has closed.
Do I need a computer to downgrade iOS?
Yes. There is no way to downgrade iOS directly from the iPhone. You need a Mac or PC with Finder, Apple Devices, or iTunes.
Can I restore from an iOS 27 backup on iOS 26?
No. iOS backups are not backwards-compatible. You cannot restore a backup made on iOS 27 to a device running iOS 26. Use a backup made before you installed iOS 27.
Will Apple stop signing iOS 26 after iOS 27 releases?
Yes. Apple typically stops signing the previous major version within 2–4 weeks of the new major release going GA. Once iOS 27 ships (expected September 2026), act quickly if you want to downgrade.
What if I do not have a backup from before iOS 27?
You can still downgrade, but you will lose data from any point after your most recent backup. If you have no backup at all, the downgrade will leave you with a factory-reset iPhone on iOS 26.
Is it possible to downgrade iOS 27 to iOS 26 wirelessly?
No. iOS downgrades always require a wired restore via Finder or Apple Devices. Over-the-air updates only move forward to newer versions.
