When Apple issues a signature, it is tied to a random number called the ApNonce (Application Nonce). 3uTools sometimes requests a blob with a generic ApNonce, but later when you try to use that blob for a restore, your device generates a different ApNonce. The signature doesn't match. As a defensive measure, Apple's servers may reject 3uTools' request outright if the ApNonce format is incorrect.
This article will not only explain why this happens but also provide a definitive, step-by-step fix. More importantly, we will discuss the part of your query: Why 3uTools might be failing you, and what superior, more reliable methods exist to save your device's blobs. i unable to request shsh 3utools fix better
Use blobsaver with "Set ApNonce" enabled, or use a jailbreak to set a generator (like 0x1111111111111111 ) before saving blobs. 3uTools cannot do this reliably. When Apple issues a signature, it is tied
SHSH (Signature HaSH) blobs are small digital signatures that Apple issues when you install iOS. Think of them as a unique handshake between your specific device and Apple's server. When you restore or update your iPhone, iTunes (or Finder) asks Apple, "Is it okay to install this iOS version?" Apple checks if that version is "signed." If yes, it issues a signature—the SHSH blob. As a defensive measure, Apple's servers may reject