On older devices (A4 and some A5 chips), the "nonce" (a random number generated during the restore process to prevent replay attacks) was static or easily predictable. This meant you could save blobs today and use them years later.
To understand why we need alternatives, we first need to understand why SHSH Host was popular and why its utility has changed. shsh host alternative
However, as the landscape of iOS security and jailbreaking has shifted, reliance on older tools like SHSH Host has diminished, and in some cases, the service has faced reliability issues or discontinuation. On older devices (A4 and some A5 chips),