Corrupted Apple Mobile Device USB drivers.
Right-click (or Apple Mobile Device USB Device) and select Uninstall device .
3uTools cannot write the updated NAND memory firmware blocks onto the device storage chip.
3uTools error -75 is intimidating, but in roughly 70% of cases, it’s caused by software mismatches, bad USB connections, or corrupted IPSW files. Start with re-downloading firmware and switching to a known-good cable. If the error survives DFU mode and a different PC, start saving for a repair or replacement—your iPhone’s baseband is likely gone for good. 3utools error unable to restore idevice--75-
Follow the specific button combination for your model (iPhone 8 and later: Volume Up, Volume Down, hold Side button) to enter DFU.
Locate and check the checkbox labeled before clicking Flash. 2. Re-register the Apple Mobile Device Driver
If you have executed a clean DFU-mode Quick Flash using a certified cable on a back USB port and it still consistently stops at the exact same percentage mark with Error -75, the problem is hardware-bound. ERROR: Unable to restore iDevice(-75). - Apple Community Corrupted Apple Mobile Device USB drivers
USB communication interruptions
Essentially, your computer is trying to send the iOS firmware (IPSW) to your iPhone or iPad, but the handshake—the verification that says "this file is safe and valid"—is failing.
: Outdated or corrupted Apple Mobile Device USB drivers. 3uTools error -75 is intimidating, but in roughly
3uTools shows "unable to restore idevice --75--" when attempting to restore or flash an iPhone/iPad. Result: Restore fails and device may be stuck in recovery/DFU mode.
Temporarily disable Windows Defender or your third-party antivirus (such as Avast, Norton, or McAfee).