In Apple's internal error mapping:
If the battery health is subpar, the restoration may fail during the verification stage. In 3uTools, you can try checking the "Fix battery health" box under the Smart Flash Phase 2: Addressing Storage and Software Glitches 3utools error unable to restore idevice--75-
Check the box next to before clicking the Flash button. 4. Perform a Clean Erase via DFU Mode In Apple's internal error mapping: If the battery
If your device can enter normal mode: