Apple drivers on your PC might be outdated or not working properly. Step-by-Step Solutions to Fix Error -75 Follow these steps in order to resolve the issue. 1. Check Hardware Connections (The Most Common Fix)
use Recovery Mode (cable on screen) for a full restore unless specifically instructed.
How to Fix 3uTools Error: "Unable to Restore iDevice (-75)" If you are trying to flash or restore your iPhone or iPad and hit the dreaded in 3uTools, you aren't alone. This error usually pops up during the "Sending Filesystem" or "Restoring" stage. 3utools error unable to restore idevice75 link
A loose or faulty Lightning/USB-C cable.
Explore a detailed fix involving battery health settings on the Apple Community Forum Apple drivers on your PC might be outdated
Low battery health or insufficient voltage from the computer’s USB port can cause the process to fail.
3uTools Error 75 almost always points to a corrupt firmware file or a bad USB connection. Re-download the IPSW, use a certified cable directly on a USB 2.0 port, and ensure you’re flashing the correct firmware for your exact iDevice model. Check Hardware Connections (The Most Common Fix) use
Ensure 3uTools is allowed through your Windows Defender Firewall. 4. Use the 3uTools "Fix Flash" or DFU Mode
Run the flash sequence to ensure uniform voltage acceptance across the system architecture. 3. Reinstall Apple Mobile Device Drivers