Without this specific driver, tools like Odin cannot communicate with the phone to install new software. Where to Find the Driver

Essentially, the is the key that unlocks communication between your PC and a bricked or ROM-mode S3 Mini.

Your S3 Mini can run again. The driver is the key. Go ahead—unzip, install, and flash.

This appears to be related to (GT-I8190), which uses the NovaThor U8500 chipset.