In 3uTools, the "Unable to restore iDevice (-75)" error typically indicates a communication or hardware-level interruption during the flashing process. It often points to insufficient power delivery, faulty connection hardware, or software interference. Common Causes
: 3uTools often verifies battery health during restoration; if the battery is failing or "subpar," it can trigger error 75. Software Interference 3utools error unable to restore idevice75 link
Subpar battery health or low voltage from the computer's USB port can trigger the error when the device draws peak power during flashing. Connection Quality: In 3uTools, the "Unable to restore iDevice (-75)"
Unstable voltage can cause the NAND (memory) to fail during the write process. Rear Ports : If using a desktop, plug your lightning cable into the rear USB ports (directly on the motherboard) for more stable power. Hardware Check The device’s flash storage may have bad sectors
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