Yes, error codes often indicate similar underlying issues. In many cases, if you get error (-75) in 3uTools, you will also encounter error 75 when attempting to restore the same device with iTunes.
Antivirus or Windows Firewall blocking the flashing process.
Note: Remember to turn your security software back on once the restore is complete. 4. Use DFU Mode Instead of Recovery Mode
When 3uTools displays the "Unable to restore iDevice (-75)" error, it means the software lost its connection to the iPhone or iPad at a critical stage of the firmware installation. The most frequent culprits include: Damaged cables or loose USB ports. 3utools error unable to restore idevice--75-
Interference from outdated versions of 3uTools, iTunes, or background security software like antivirus programs.
Turn off your Windows Firewall or add 3uTools to the firewall's whitelist/allowed applications list.
: As highlighted by 3uTools' own support documentation, error 75 can occur when you are trying to restore an iTunes backup via 3uTools while your phone is simultaneously in the process of syncing with iCloud. This causes a direct conflict that interrupts the restoration process. Yes, error codes often indicate similar underlying issues
The error message itself doesn't provide much insight into the cause, but it does indicate that the problem lies in the communication between 3uTools and the iDevice.
Corrupt or incompatible IPSW (firmware) files
Follow these diagnostic steps sequentially to successfully complete your restore process. 1. Enable the "Fix Battery Health" Flash Script Note: Remember to turn your security software back
: Use 3uTools to "Refresh iDevice Info" and check available space. If it's too full, you may need to perform a full flash rather than a standard update. Connection and Drivers
Error -75 is a generic communication and verification failure. It means the data transfer between your computer, Apple's verification servers, and your iOS device was interrupted.