Once 3uTools detects a device in DFU mode, navigate to and try the request again. Manually Enter ECID

For advanced users, this script-based tool supports saving blobs even for unsigned versions if you have a jailbreak that allows setting a boot nonce.

To fix the "Unable to request SHSH" error in 3uTools (often occurring at the 9% or 19% mark), you typically need to update the 3uTools software

For newer devices (iPhone 6s and later, especially A12+), the default “Request from Apple” method fails because Apple requires a that matches your device’s current state. 3uTools’s automatic request may generate a mismatched nonce.