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Currently, the stable version is or higher (as of 2025). Anything below v2.60 is likely to fail.
: Apple stops "signing" older iOS versions shortly after new ones are released. If you are trying to flash an unsigned version , 3uTools cannot retrieve the necessary SHSH blobs from Apple, and the process will fail. Check a site like IPSW.me to ensure your firmware version is still active. Connection & Network Fixes
: If the error occurs in "Easy Flash," switch to the iTunes Flash tab within 3uTools. This mode uses different protocols that can sometimes bypass the SHSH request bug.
In 99% of cases, or switching to the latest signed iOS will resolve "Unable to request SHSH" immediately.
✅ After disabling, re-run the flash. Re-enable firewall after success.
Move to method #4.
Currently, the stable version is or higher (as of 2025). Anything below v2.60 is likely to fail.
: Apple stops "signing" older iOS versions shortly after new ones are released. If you are trying to flash an unsigned version , 3uTools cannot retrieve the necessary SHSH blobs from Apple, and the process will fail. Check a site like IPSW.me to ensure your firmware version is still active. Connection & Network Fixes
: If the error occurs in "Easy Flash," switch to the iTunes Flash tab within 3uTools. This mode uses different protocols that can sometimes bypass the SHSH request bug.
In 99% of cases, or switching to the latest signed iOS will resolve "Unable to request SHSH" immediately.
✅ After disabling, re-run the flash. Re-enable firewall after success.
Move to method #4.