With the phone in DFU mode, a certified cable plugged in, and the antivirus turned off, Alex decided to try requesting the SHSH blob for the currently signed iOS version instead of the old one.
You are using an old version of 3uTools or iTunes drivers.
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Outdated versions of flashing tools often cause server request failures because Apple frequently updates its authentication protocols. Open 3uTools.
Apple only allows users to install iOS versions that it actively signs. If you downloaded an older IPSW firmware file manually, Apple's authentication servers will actively reject the SHSH request. With the phone in DFU mode, a certified
Open the Windows Command Prompt as an Administrator, type ipconfig /flushdns , and press Enter . Clean the Hosts File: Navigate to C:\Windows\System32\drivers\etc . Open the file named hosts using Notepad. Look for any lines containing apple.com or ://apple.com .
For a , the "unsigned firmware" issue is the most critical. Since you've never used it before, you likely haven't had the chance to save SHSH blobs, so you can't install any iOS version that Apple is no longer signing. Any downgrade attempt is practically impossible without previously saved blobs. Your course of action is limited to updating or restoring to the latest signed version. This link or copies made by others cannot be deleted
An (Signature Hash) is a unique digital signature that Apple uses to approve iOS installations. Whenever you flash a device, 3uTools contacts Apple's servers to request this signature.
If you have a truly new device (like an iPhone 15 or later), Apple's security protocols are the most advanced. 3uTools must have an update that officially supports that model's chip and bootrom for these techniques to work. This further underscores the importance of .
In the flashing tool, check the option that says Retain User's Data (note: this is not recommended for downgrading).
Using an outdated version of 3uTools can prevent it from communicating properly with Apple's servers.