If you need to restore another device of the same model, you don't need to download the firmware again. Click in the flash section of 3uTools.
Another quick method:
This creates a "junction" that makes Windows (and 3uTools) think the files are still on the C: drive, when they are physically on the D: drive. 3utools ipsw location top
When you use 3uTools to flash or upgrade an iPhone, iPad, or iPod, the software downloads firmware images that regularly exceed 5 GB to 8 GB each. If left unchecked, these hidden downloads can quickly overwhelm your system drive. This comprehensive guide covers everything you need to know about locating, changing, managing, and troubleshooting the 3uTools IPSW path. 1. Default 3uTools IPSW Location on Windows If you need to restore another device of