3uTools error (-75) , typically described as "Unable to restore iDevice," is a vague but critical error often linked to insufficient power delivery subpar battery health
Power & Battery Issues: The most common trigger is low battery voltage or a degraded battery that fails the restoration verification check. 3utools error unable to restore idevice--75-
Physical Connection Issues: Loose or damaged USB cables, or faulty USB ports on the PC. 3uTools error (-75) , typically described as "Unable
Software Interference: Active third-party security software or an open iTunes instance can conflict with 3uTools' drivers. Recommended Solutions Step Why it works 1 Check "Fix Battery Health" the NAND flash may be corrupted
Memory/NAND Failure: If your storage was completely full before the error, the NAND flash may be corrupted, requiring a "Quick Flash" (wipe) rather than a "Retain User Data" flash.