However, a common roadblock appears when you try to update or restore a device via "iTunes Flash" or "Easy Flash" in 3uTools. You click start, wait a few minutes, and then the screen turns red with the dreaded message:
This is the #1 culprit. When you check "Retain User Data," 3uTools uses a modified flash process that requires specific SHSH validation. Apple’s modern servers often reject it. how to fix error unable to request shsh on 3utools when upd
Apple only allows you to install iOS versions that they are currently "signing". If you are trying to downgrade to an older version that Apple has "closed," you will consistently get the "Unable to request SHSH" error because Apple's servers refuse to provide the signature. However, a common roadblock appears when you try
An outdated 3uTools may try to request SHSH using an old protocol that Apple no longer accepts. Apple’s modern servers often reject it