Here is the information regarding the IPSW location in 3uTools:
Open File Location: In the window that appears, find your firmware file, right-click it, and select "Open File Location". 3utools ipsw location top
By default, 3uTools stores downloaded firmware files in the following directory on your Windows PC: Here is the information regarding the IPSW location
Where Does 3uTools Download IPSW Files? By default, 3uTools stores all downloaded iOS firmware (IPSW) files in a dedicated folder on your primary drive, typically located at C:\3uTools-Firmware. If you have changed the installation path or cannot find them there, you can easily locate them directly through the software. How to Find Your IPSW Files in 3uTools find your firmware file