3uTools provides a guide for your specific model on how to enter DFU mode under the section. 5. Check the IPSW Firmware File
Error -75 is often caused by a "Missing data volume" error when trying to retain user data on a full device. remdevice.ru : Instead of "Retain User's Data," select Quick Flash Mode 3utools error unable to restore idevice75 link
The error in 3uTools typically occurs during a firmware flash or restore process and is often linked to insufficient power delivery , subpar battery health , or NAND firmware issues . Common Causes 3uTools provides a guide for your specific model
A damaged or non-certified Lightning/USB-C cable, or a loose charging port, can trigger the error. remdevice
This error typically indicates that the connection between your device and the computer was interrupted during the verification stage, or that the software environment (drivers/itunes) is conflicting with 3uTools.