The most common fix is updating to the current version. The 3uTools development team released specifically to address the "Unable to Request SHSH" error. To update:
Here is a comprehensive guide to understanding and resolving this issue.
On rare occasions, your computer's hosts file might be redirecting Apple's verification servers. how to fix error unable to request shsh on 3utools when top
Sometimes your ISP or local network (especially at schools or offices) blocks Apple's signing servers. Switching to a VPN can bypass these restrictions.
Sometimes "Normal Mode" or "Recovery Mode" fails to trigger the SHSH request correctly. The most common fix is updating to the current version
: This is the most successful solution. Older versions of 3uTools may have bugs or outdated server links that prevent SHSH requests. Visit the official 3uTools Download Page to get the latest version.
Note that for modern 64-bit devices, a downgrade using saved blobs also requires a matching firmware compatibility, which restricts how far back you can successfully downgrade. Conclusion On rare occasions, your computer's hosts file might
If you’re seeing the error in 3uTools (especially when trying to save blobs from the top toolbar or during a flash attempt), here’s how to fix it.
Download the absolute latest build directly from the official 3uTools Desktop Client.
After changing your DNS, restart your computer and try the flash again.