Connect your device to the PC and Open 3uTools. Click “iDevice”, you will see as below, the product type is circled in red. Now you could download firmware based on your product type.
Please use the 3uTools PC client to install the iOS client:
1、Install either the Windows or Mac version of 3uTools on your computer
2、Open the PC client and connect your device to the computer via USB cable
3、After the connection is successful, wait for the computer to automatically install the mobile app for the device, or locate “Install Mobile App” on the computer and manually click to install.