: Outdated or corrupted Apple Mobile Device USB drivers.
Antivirus programs can misinterpret the flashing process as a security threat, cutting the connection.
: Open 3uTools and click Check Update in the bottom-right corner to ensure you have the latest bug fixes. 3utools error unable to restore idevice--75-
: A failing battery or a motherboard issue (such as NAND or CPU brownout) that causes the device to disconnect under the heavy load of a restore. Step-by-Step Solutions 1. Optimize the Physical Connection
: If using a desktop, plug the cable into the rear USB ports directly on the motherboard. Avoid using USB hubs or front-panel ports, which often provide lower power and less stability. 2. Refresh Drivers and Software : Outdated or corrupted Apple Mobile Device USB drivers
: Go to the Toolbox tab in 3uTools and select iTunes Utility . Click on Repair Driver to reinstall the necessary Apple communication components. 3. Use DFU Mode
: Third-party antivirus or firewalls blocking the restore process. : A failing battery or a motherboard issue
Select the firmware and try the flash again. This often resolves stubborn software hangs. 4. Disable Security Software
Put your device into DFU mode (the screen should remain completely black). 3uTools will detect it as "DFU Mode."
: Always use an official Apple MFi-certified Lightning or USB-C cable.