Can We Downgrade iOS with Unsigned IPSW? - 2024 August | iOS Downgrade
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Are you trying to downgrade your iPhone to an older iOS version like iOS 16/15/14? But found the IPSW file unsigned with a red "X"? Wondering if you can still perform the downgrade? In this video, we’ll explore whether it's possible to downgrade to unsigned iOS IPSW files without data loss. Let’s dive in!
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00:00 Introduction
00:20 Section 1: Why Are Some IPSW Files Unsigned, and How Does It Work?
01:10 Section 2: Get Various iOS Files & Safely Downgrade with ReiBoot
01:50 Section 3: Can We Install Unsigned iOS Using SHSH Blobs?
02:30 Section 4: Tools and Their Limitations
02:55 Section 5: Can Delay OTA Help with Downgrades?
03:30 Section 6: The Reality of Downgrading
💡Text guide here:
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Can We Downgrade iOS with Unsigned IPSW?
Section 1: Why Are Some IPSW Files Unsigned, and How Does It Work?
- Apple stops signing older iOS versions once they become outdated, meaning they no longer approve them for installation.
- Unsigned versions cannot be installed through official methods due to updated security protocols. Methods found online might be outdated and ineffective.
Section 2: Get Various iOS Files & Safely Downgrade with ReiBoot
1. Use ReiBoot to access available iOS files for upgrading or downgrading.
2. ReiBoot supports downgrades if Apple re-signs older versions or if the software supports them.
Section 3: Can We Install Unsigned iOS Using SHSH Blobs?
1. Earlier versions had tools to bypass signature checks, but this changed with iOS 5 due to new security features.
2. Newer iOS versions use complex security, making downgrades challenging without jailbreaking.
Section 4: Tools and Their Limitations
1. Tools like Future Restore used to work with SHSH blobs but are now unreliable.
2. Air Squared Blob Saver can save blobs but is not dependable for immediate downgrades.
Section 5: Can Delay OTA Help with Downgrades?
1. Delay OTA helps upgrade to recently unsigned versions, not for downgrading.
2. Useful within three months after signing ends.
Section 6: The Reality of Downgrading
- Downgrading from iOS 17.5 to iOS 16 on newer devices is nearly impossible with current methods.
- Best practices include avoiding updates or using safe tools like iTunes or ReiBoot for downgrades.
🤨Understanding Key Terms and Resources
IPSW File: An iOS firmware file used to update or restore iOS devices.
SHSH Blobs: Cryptographic tokens used to verify iOS firmware signatures, historically allowing downgrades but now largely ineffective due to advanced security measures.
ReiBoot: A tool for repairing iOS systems and managing firmware installations, offering safe downgrades and updates without data loss.
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📑Apple Official Article Links
About iOS firmware and signing: https://forums.developer.apple.com/fo...
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