Many users reporting Error 75 on newer operating systems found that switching from a USB-C to Lightning cable to a standard USB-A to Lightning cable fixed the issue.
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.
[2026 Guide] iPhone/iTunes Error 75: What It Means & How to Fix - ReiBoot 3utools error unable to restore idevice--75-
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The "unable to restore iDevice(-75)" error in 3uTools, while frustrating, is rarely the end of the line for your device. As this guide has shown, the problem most often stems from a manageable set of common issues: a faulty physical connection, a full iPhone hard drive, or a simple software conflict. Many users reporting Error 75 on newer operating
Back inside the 3uTools menu, click Import and select that exact desktop .ipsw file.
: Third-party antivirus or firewalls blocking the restore process. As this guide has shown, the problem most
Remember to re-enable your security software after the restore.