ReiBoot - No.1 Free iOS System Repair Software
Fix 150+ iOS Issues without Data Loss & Safely Upgrade/Downgrade
ReiBoot: No.1 iOS Repair Tool
Fix 150+ iOS Issues, No Data Loss
Querying for SHSH file on Apple server is the first step to saving SHSH blobs, which are essential for downgrading or restoring your iPhone to unsigned iOS versions. Whether you're facing errors like "Unable to Request SHSH" on 3uTools or planning to downgrade from iOS 18, understanding this process is key.
In this guide, we’ll show you how to successfully query and download SHSH blobs, troubleshoot common issues, and explore alternatives so you can take full control of your device’s iOS version.
SHSH blobs are a vital part of Apple's digital signature system. These are unique cryptographic signatures created by Apple, specifically tied to your iPhone, iPad, or iPod touch and a particular iOS version.
When you update or restore your device, Apple checks SHSH blobs to confirm if the iOS version is still signed. Without them, installs will fail. Saving SHSH blobs lets you downgrade to older iOS versions even after Apple stops signing them, using tools like 3uTools or FutureRestore.
Querying SHSH blobs from Apple servers is an important step if you plan to downgrade or restore your iOS device using older firmware versions. Without these blobs, bypassing Apple’s signing restrictions becomes nearly impossible.
This is important when you want to:
These factors often lead to the “Unable to Get SHSH Blobs for This Device” error in 3uTools. Understanding SHSH blobs is the first step to fixing this. By saving valid blobs during Apple’s signing window, you gain the ability to downgrade iOS 18, 17, or 16 even after support ends. With the right tools, you can restore your device outside Apple’s limits and maintain control over your firmware.
SHSH blobs are essential if you want to downgrade your iPhone to an older iOS version. However, you can only save them while Apple is still signing the firmware. Once the signing window closes, you won’t be able to generate SHSH blobs for that version.
To get SHSH blobs, you can either use Blobsaver or look for an iOS 18 SHSH blobs download APK. But one of the easiest methods is using an online tool like TSS Saver, which doesn’t require a computer.
Here’s how to get SHSH blobs by querying Apple’s server using TSS Saver:
Step 1: Connect your iPhone to your computer. Open iTunes, select your device, and click on the Serial Number until you see the ECID. Copy the ECID.
Step 2: Open your browser and go to the TSS Saver website.
Step 3: Paste the ECID you copied. Select your device model from the drop-down menu.
Step 4: Click on the “Submit” button. TSS Saver will now query Apple’s servers and save SHSH blobs for the iOS versions that are still signed.
Step 5: After processing, a download link will be provided. Click the link to save your SHSH blobs on your computer or cloud storage.
For older devices (like iPhone 4), SHSH blobs can still be backed up even if Apple has stopped signing that firmware version.
If you don’t have SHSH blobs but still want to downgrade your iPhone, Tenorshare ReiBoot is the best tool to do it. This powerful iOS system recovery software lets you install unsigned IPSW files without needing SHSH. It also helps fix iOS issues like boot loops, recovery mode, and Apple logo stuck. Whether you're facing iOS 18 problems or want to go back to iOS 17, ReiBoot makes the process safe, easy, and fast—no jailbreak or iTunes needed.
Key Features of Tenorshare ReiBoot:
Steps to Install Unsigned IPSW Without SHSH:
This error usually means that Apple has stopped signing the firmware you're trying to download SHSH for. To fix it:
Yes, but with limitations. In 3uTools:
Restoring unsigned IPSW is tricky. Technically, it’s possible if you have saved SHSH blobs for that version. But even then, the process is complex, not always successful, and prone to errors. If you don’t have SHSH blobs, consider using tools like Tenorshare ReiBoot to downgrade without them.
Querying for SHSH file on Apple server is crucial if you want to downgrade or restore your iPhone using unsigned IPSW files. However, this process can be tricky, especially when Apple stops signing older iOS versions. If you’re facing errors like “unable to request SHSH” in 3uTools or don’t have saved blobs, we highly recommend using Tenorshare ReiBoot.
It lets you downgrade iOS without SHSH blobs, fix common iOS issues, and even install unsigned firmware safely. Whether you're a beginner or tech-savvy user, ReiBoot makes downgrading and system repair simple and secure.
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By Jenefey Aaron
2025-04-24 / Fix iPhone
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