3utools Error Unable To Restore Idevice75 Link -

Always use an Apple-certified MFi cable. Third-party cables often fail during the heavy data load of a restore.

3uTools provides a guide for your specific model on how to enter DFU mode under the section. 5. Check the IPSW Firmware File 3utools error unable to restore idevice75 link

DFU mode is a deeper state than Recovery Mode; it doesn't load the device OS, which bypasses many software-level "handshake" errors. Always use an Apple-certified MFi cable

If you have tried all the above and still receive Error -75, there is a high probability of a on the device itself, such as a failing NAND (memory) chip or a damaged charging port assembly. it doesn't load the device OS