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
This error typically appears mid-way through a restore or firmware flash, leaving your device stuck in Recovery Mode, DFU Mode, or with a black screen. But what does error -75 mean, and—most importantly—how do you fix it? 3utools error unable to restore idevice--75-