Cheap third-party cables often fail during data-heavy tasks like SHSH requests.
Sometimes, 3uTools struggles to grab the ECID or necessary device identifiers while the phone is in regular "Normal" mode. Connect your device to your computer.
Manually put your iPhone or iPad into (the steps vary by model). how to fix error unable to request shsh on 3utools when new
Click the button at the bottom right corner.
Check sites like IPSW.me to see if the firmware is still green (signed). Cheap third-party cables often fail during data-heavy tasks
If you are on a restrictive office or school Wi-Fi, try using a mobile hotspot. Update 3uTools to the Latest Version
Apple only allows SHSH requests for currently signed iOS versions. Manually put your iPhone or iPad into (the
Use a port directly on the motherboard (back of the PC) rather than a front-panel port or a hub.
If an update is available, install it and restart the program before trying the request again. Use DFU Mode for the Request