Antivirus programs can misinterpret the flashing process as a security threat, cutting the connection.

Right-click the Windows Start menu and select .

Turn off your Windows Firewall or add 3uTools to the firewall's whitelist/allowed applications list.

Never use USB hubs or keyboard passthrough ports for flashing. 2. Update 3uTools and iTunes Drivers

Right-click (or Apple Mobile Device USB Device) and select Uninstall device .

If the error persists after multiple attempts across different computers and cables: How to fix error 75 on iPhone 11 during restore process?

The "unable to restore iDevice (-75)" error is often associated with the NAND firmware update process . It indicates a communication breakdown between 3uTools and the device's storage system (NAND) during the flashing process.

Select your matching firmware, and check the option for .

This error primarily points to a sudden communication breakdown between the computer and the iOS hardware, or a failure to format and mount the device's storage partitions properly.

Using low-quality cables or front-panel PC ports that don't provide consistent power or data throughput.

A target device with maxed-out physical storage cannot handle temporary unpacking files, forcing an AMRestoreErrorDomain code: 75 crash.