About This Firmware
iOS 26.3.1
(build 23D8133) is an official Apple IPSW
for the iPhone 17 Pro Max,
released on 2026-03-04.
The file is served directly from Apple's CDN.
This firmware is no longer signed by Apple. Standard downgrades are not possible, but the file remains available for reference and advanced use.
Verify the download using the checksums below.
Filename
iPhone18,2_26.3.1_23D8133_Restore.ipsw
Checksums
SHA-256
b76c889d9aada7859a181848fbc04fc9a35f1f946b82e9ea7f081a034bcaa741
SHA-1
91e56c4620ec6f1a878cc7dc68157a96a21a1fe0
MD5
d76258a3cd8740f668815cf4b89a9970
Direct URL
https://updates.cdn-apple.com/2026WinterFCS/fullrestores/047-89691/F4F2DBF0-41AA-4B6E-ABDB-96EAB5D7CE1E/iPhone18,2_26.3.1_23D8133_Restore.ipsw
Other Devices
iPhone X (GSM)
iPhone10,6
iPhone 16 Plus
iPhone17,4
iPhone 14 Pro Max
iPhone15,3
iPhone SE
iPhone8,4
iPhone 11 Pro
iPhone12,3
iPhone 6s+
iPhone8,2
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your iPhone 17 Pro Max via USB.
- Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina+) and select your device.
- Update (keep data): hold Option (Mac) or Shift (Windows) and click Update, then pick the .ipsw file.
- Restore (erase & install): hold Option / Shift and click Restore iPhone…, then pick the .ipsw file.
- Wait for the process to finish - do not disconnect.
Restoring will erase all data on the device. Back up first.
3uTools
Windows- Download and install 3uTools from 3u.com.
- Connect your iPhone 17 Pro Max via USB and trust the computer on the device.
- Go to Flash & JB > Easy Flash.
- Click Import and select the downloaded .ipsw file.
- Choose Flash mode: Update keeps data, Restore wipes the device.
- Click Flash and wait for the progress bar to complete - do not disconnect.
Only flash firmware that matches your exact device model.
DFU Mode
Recovery tipIf your device is stuck in a boot loop or iTunes/Finder does not recognise it, enter DFU mode first, then select the .ipsw file as normal.
iPhone 8 / X and later
- Quickly press & release Volume Up
- Quickly press & release Volume Down
- Hold Side button until screen goes black
- Hold Side + Volume Down for 5 s
- Release Side, hold Volume Down 5 more s
- Black screen = DFU active
iPhone 7 / 7 Plus
- Hold Sleep/Wake + Volume Down for 8 s
- Release Sleep/Wake, keep holding Volume Down for 5 s
- Black screen = DFU active
iPhone 6s and earlier
- Hold Sleep/Wake + Home for 8 s
- Release Sleep/Wake, keep holding Home for 5 s
- Black screen = DFU active