Note: Never disable security while browsing the web. Disconnect from the internet if possible.
Windows users must have a clean driver setup. 3utools error unable to restore idevice75 link
Real-time protection can interrupt the handshake. Note: Never disable security while browsing the web
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
In the context of 3uTools, error code 75 generally points to an interruption during the data writing phase of the restore process.
Driver issues are a common source of instability that can cause a restore to fail at various stages.