When you attempt to flash firmware, 3uTools requests a signature from Apple for your specific device's unique identifier (ECID). If this request fails, the process stops. Common causes include:
If the error persists, try a different flashing method. how to fix error unable to request shsh on 3utools when top
Outdated software often causes compatibility issues with new Apple signing methods. When you attempt to flash firmware, 3uTools requests
This method works only for specific older iPhones and requires pre-saved SHSH blobs for that particular device and iOS version. When you attempt to flash firmware
A flickering Wi-Fi connection or a strict firewall can block the SHSH request.
), 3uTools cannot request the SHSH blobs because Apple's servers will not provide them. Check Network Stability