Plug your cable directly into the rear USB ports of your PC's motherboard to ensure maximum power output.
Before diving into the fixes, it helps to understand why this error happens. The most common culprits include:
No. In most cases, the solutions above (especially DFU + manual IPSW) will revive the device. Only physical baseband damage results in permanent bricking.
Follow the specific button combination for your device model (e.g., iPhone 8 or newer: press Volume Up, press Volume Down, hold Power until the screen goes black, then hold Power + Volume Down for 5 seconds, release Power but keep holding Volume Down). 3utools error unable to restore idevice--75-
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
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After a successful iTunes restore, you can use 3uTools again for other tasks. Plug your cable directly into the rear USB
Turn off your Windows Firewall before hitting the "Flash" button.
If you are using a desktop PC, plug the cable into the rear USB ports directly on the motherboard. Front panel ports and external USB hubs often lack stable power distribution.
Apple devices are notoriously picky. If you are using a third-party "charging only" cable or a frayed one, the restore will fail. In most cases, the solutions above (especially DFU
If the device's battery is degraded or dead, it may not hold enough voltage to sustain the high-power flashing process. Replacing the battery often resolves the issue.
If your device is throwing Error -75 due to insufficient power or poor battery reporting, you can bypass this limitation using the built-in Smart Flash feature.
If you want, I can:
If you're using a beta version of 3uTools or a specific feature (like "Easy Flash"), try a standard restore or use iTunes to see if the issue persists.