If you have tried different cables, computers, and DFU mode, and the error persists at exactly the same percentage every time, it may be a hardware issue.
Would you like a step-by-step visual guide or help interpreting your device’s specific 3uTools log output for error -75?
: Temporarily turn off your antivirus or Windows Firewall during the restoration process. 3utools error unable to restore idevice--75-
To understand error -75, you must understand the iOS restore process. When 3uTools (or iTunes) flashes firmware, it verifies the firmware file (IPSW) with Apple’s servers, extracts it, and writes the data to your device’s NAND flash storage.
If the phone constantly boot-loops back into standard Recovery Mode, forcing the device into a deeper Device Firmware Update (DFU) state bypasses loaded software and interacts directly with the secure boot ROM. If you have tried different cables, computers, and
An outdated version of 3uTools may lack the drivers necessary for the latest iOS firmware.
Security software can mistake the deep system connection 3uTools makes during a flash for a malicious intrusion, abruptly cutting the connection. To understand error -75, you must understand the
Physical damage or degradation to the device's storage chip can prevent the firmware from being written properly.
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