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How To Fix Error Unable To Request Shsh On 3utools When Upd

Apple only “signs” the latest few iOS versions for each device. If you try to install an older, unsigned version, 3uTools cannot get SHSH blobs for it.

How to check:
Visit ipsw.me and select your device. If the iOS version you want shows as unsigned, you cannot flash it normally.

Solution:
Download a version that is still signed and try again.

Let’s say you have an iPhone 12 on iOS 17.2 and you want to update to iOS 17.3.1 (which is still signed), but 3uTools keeps saying "Unable to request SHSH." how to fix error unable to request shsh on 3utools when upd

Follow this exact sequence:

In 95% of cases, this sequence will succeed.

Security software can block 3uTools from reaching Apple’s SHSH server. Apple only “signs” the latest few iOS versions

  • Third-party AV (Norton, McAfee, Avast, etc.): Disable real-time protection.
  • Add 3uTools as an exception to prevent future blocks.

    • ✅ Solution: After disabling, re-run the flash. Re-enable firewall after success.

    Some jailbreak tools or third-party software modify your Windows hosts file to block Apple’s servers (to prevent auto-updates). This directly prevents SHSH requests.

    Steps to reset hosts file:

    If you have tried all nine methods and still face the error, the problem is likely one of these:

    In 99% of cases, unchecking "Retain User Data" or switching to the latest signed iOS will resolve "Unable to request SHSH" immediately.

    Before fixing it, it helps to know what went wrong. SHSH Blobs (Signature HaSH) are digital certificates Apple uses to authorize iOS installations. When you click "Update" or "Flash" in 3uTools, the software has to "request" permission from Apple's servers to install that specific iOS version. In 95% of cases, this sequence will succeed

    If 3uTools cannot "request SHSH," it means the handshake with Apple failed. This prevents the installation from starting to protect your device from getting stuck in a boot loop.