You are trying to install an iOS version that Apple has "closed" or stopped signing. Apple generally only signs the latest versions of iOS to prevent users from downgrading to older, potentially less secure versions. Network Blockage:
Your firewall, antivirus, or host file is blocking the connection to Apple's TSS (Telesign Server). 3utools error unable to request shsh hot
He right-clicked the 3uTools icon on his desktop and opened the file location. He navigated through the folders, looking for the cache where the SHSH requests were temporarily stored before being sent to Apple's servers. He found the folder: C:\Program Files\3uTools\cache\shsh . You are trying to install an iOS version
If 3uTools repeatedly fails, use command-line tools: use command-line tools: