Before opening 3uTools, visit a signing status website (such as ipsw.me or The iPhone Wiki ). Select your device model and verify if the iOS version you are trying to flash is still being signed by Apple.
For three hours, he had been trying to downgrade his iPhone to a signed version of iOS, but 3utools Error Unable To Request Shsh
Change the file type dropdown in the bottom right from Text Documents (*.txt) to All Files . Open the file named . Before opening 3uTools, visit a signing status website
A faulty USB cable or port can interrupt the request process mid-way. Common Fixes Open the file named
If Apple is "signing" that version, it sends back an SHSH blob, and the installation proceeds. If Apple has stopped signing that version (usually a few weeks after a new update), the server refuses the request, resulting in the "Unable to Request SHSH" error. Common Causes & Quick Fixes 1. The iOS Version is No Longer Signed
A poor internet connection can prevent 3uTools from communicating with Apple servers. Ensure your computer has a stable internet connection.
Delete those lines, save the file, and restart your computer. 4. Disable Firewall and Antivirus Software