: Sometimes data transmission errors mimic SHSH request failures. Use an original Apple Lightning/USB-C cable and a USB port directly on the motherboard (for desktops).

To understand the error, you first need to know what SHSH blobs are. SHSH stands for Signature HaSH, a small piece of data that is part of Apple's digital signature protocol for iOS restores and updates. It is designed to control the iOS versions that users can install on their devices.

If the error persists, 3uTools often suggests downloading the firmware again or choosing a slightly newer version that is still being signed. Pro Tip: Save SHSH Blobs in Advance

You are using an old version of 3uTools or iTunes. Step-by-Step Solutions 1. Check the Signing Status