Recovery Mode often fails when error -75 occurs. DFU (Device Firmware Update) Mode bypasses the bootloader and allows a complete fresh install.
If you are trying to downgrade (e.g., moving from iOS 17 back to iOS 16) or upgrade to a specific version, you check if Apple is still signing that version. 3utools error unable to restore idevice--75-
Check your to ensure no Apple servers (like gs.apple.com ) are being redirected. 5. Rule Out Hardware Failure Recovery Mode often fails when error -75 occurs