Temporarily disable Windows Defender or your third-party antivirus (like Avast or McAfee).
Running an outdated version of 3uTools can lead to compatibility issues with newer iOS versions. Check for updates in the bottom right corner of 3uTools.
Error -75 is frequently caused by a physical connection drop. Even if the cable looks fine, it might not be maintaining the data transfer speeds required for a full restore. 3utools error unable to restore idevice75 link
DFU mode is a deeper state than Recovery Mode; it doesn't load the device OS, which bypasses many software-level "handshake" errors.
Always use an Apple-certified MFi cable. Third-party cables often fail during the heavy data load of a restore. Error -75 is frequently caused by a physical connection drop
Use a toothpick or compressed air to gently remove any lint or debris from your iPhone's lightning/USB-C port. 2. Repair Drivers via 3uTools
A corrupted firmware download can cause the restore to hang and time out. Always use an Apple-certified MFi cable
Ensure you have the latest version of iTunes installed on your PC, as 3uTools relies on iTunes' background services to communicate with your device. Summary Table Potential Cause Swap to an original Apple MFi cable. Connection Port Use a USB 2.0/3.0 port on the back of the PC. Software Conflict Disable Firewall/Antivirus. Driver Issue Use 3uTools "Repair Driver" utility. State of Device Switch from Recovery Mode to DFU Mode.