iOS 26.3.1 (23D8133) for iPhone 13 Pro Max – Official IPSW Download
Below are the complete firmware specifications for iOS 26.3.1 (Build 23D8133) designed for the iPhone 13 Pro Max.
This IPSW file is specifically built for the model identifier iPhone14,3, so it is important to ensure you download the correct version before attempting a restore or manual installation.
iPhone 13 Pro Max – iOS 26.3.1 (23D8133) IPSW Details
| Firmware Information | Details |
|---|---|
| Device | iPhone 13 Pro Max |
| Model Identifier | iPhone14,3 |
| iOS Version | 26.3.1 |
| Build Number | 23D8133 |
| Release Date | March 4, 2026 |
| Signing Status | ✅ Signed |
| Firmware Type | Restore IPSW |
| File Name | iPhone14,3_26.3.1_23D8133_Restore.ipsw |
| File Size | Approximately 10 GB |
| SHA1 Checksum | Available on the official download page |
| SHA256 Checksum | Available on the official download page |
| MD5 Checksum | Available on the official download page |
Recommended Mirror
Download via Secure Archive Server
Fast Access • High Speed Mirror • No Corrupt File
✔
Verified Download – iOS 26.3.1 IPSW
Official Signed Firmware • Safe & Secure
This link redirects to Apple’s official firmware servers, ensuring the file is authentic and unmodified.
If the firmware remains signed, you can use it to perform a clean restore, fix software-related issues, or manually update your device via Finder, iTunes, or the Apple Devices app on Windows.
Conclusion
Updating to iOS 26.3.1 (23D8133) on your iPhone 13 Pro Max ensures the latest security patches, improved stability, and optimized performance. While it doesn’t add major new features, it strengthens overall system reliability.
If the firmware is still signed, you can safely perform a clean restore or manual update using the official IPSW file. Before updating, make sure to:
- Back up your data
- Download the correct file for iPhone14,3
- Verify the checksum after downloading
Staying on the latest signed version helps keep your device secure, stable, and fully compatible with Apple’s ecosystem.
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