Are you attempting to to the newest firmware, or are you trying to downgrade to an older version?
These often block the specific ports 3uTools needs to talk to Apple. Repair Drivers: in 3uTools and click on iTunes Utility Repair Driver how to fix error unable to request shsh on 3utools when new
Fixing the "Unable to Request SHSH" error in 3uTools can be frustrating, especially when you are working with a brand-new device or a freshly released iOS version. This error typically occurs when 3uTools cannot communicate effectively with Apple's servers or when the specific SHSH blobs you are requesting are no longer being signed. Are you attempting to to the newest firmware,
: The most frequent fix for newer devices (like the iPhone 15 Pro) is simply installing the absolute latest version of 3uTools . Older versions may lack support for newer hardware identifiers or Apple's updated server protocols. This error typically occurs when 3uTools cannot communicate
Ironically, the latest version of iTunes (12.12 or 12.13) sometimes has broken API calls for brand new devices. The older version 12.10.11 is known to be more stable for SHSH requests.
If all else fails, the new device may have a corrupted nonce generation subsystem. A DFU (Device Firmware Update) restore resets this subsystem completely. This will erase your new iPhone, so back up first.
: For some specific device models, you may need to copy your device's EID code and verify the firmware availability on third-party verification sites like SH.host to ensure the version you have matches the expected signature.