Check sites like IPSW.me to see if the firmware is still green (signed).
: Download and install the latest version. This resolves compatibility issues with newer iOS versions and hardware like the iPhone 15 Pro. how to fix error unable to request shsh on 3utools when new
Right-click 3uTools icon → "Run as administrator" . Mac: Open Terminal → sudo /Applications/3uTools.app/Contents/MacOS/3uTools Check sites like IPSW
If standard updates don't work, community experts suggest these technical workarounds: community experts suggest these technical workarounds: