Alex remembered that Apple only "signs" certain firmware versions. If Alex was trying to downgrade to an iOS version that Apple had already "closed," the SHSH request would always fail because the server refused to provide the necessary digital key. Alex checked a site like
If you are an iOS enthusiast who enjoys downgrading firmware, jailbreaking, or restoring legacy devices, you have likely used . It is one of the most powerful third-party tools for managing iPhones and iPads on Windows. However, a common roadblock that stops users in their tracks is the dreaded error message: how to fix error unable to request shsh on 3utools when top
: Apple stops "signing" older iOS versions shortly after new ones are released. If you are trying to downgrade to an unsigned firmware, the request will fail because Apple's servers will no longer provide the necessary SHSH blobs. Switch to "iTunes Flash" Understanding SHSH Blobs Alex remembered that Apple only
Many users resolve this error simply by updating the software. In 3uTools, check logs or any specific error