Your security software might be blocking the connection.
: Apple stops "signing" older iOS versions shortly after new ones are released. You cannot request SHSH blobs for an unsigned version; verify current signing status on sites like IPSW.me .
If your system is unable to reach Apple's signature servers, it cannot fetch the required SHSH blob.
For future downgrades, use a dedicated SHSH saving tool to preemptively save blobs.
When you see "Unable to Request SHSH," it usually means one of two things:
If the firmware version is , there is unfortunately no way to "fix" the error to get new blobs. However, if the version is signed and you are still failing, putting the device in DFU mode and running 3uTools as an Administrator are the two most successful solutions.
If "Easy Flash" fails, try using the iTunes engine within 3uTools.
Temporarily disable firewall and antivirus software that might be interfering with 3uTools:
If none of the above steps work, you're likely trying to install an iOS version that is unsigned. Here are your remaining options:
If none of the above solutions work, you can try using alternative tools or methods:
