: In some cases, if the restore consistently fails at 20%, it may indicate a hardware fault with the NAND chip itself. 4. Use DFU Mode with a Clean IPSW
Error “link 75” is rarely a fatal hardware issue. In 80% of cases , switching to DFU mode, using a rear USB 2.0 port, and updating 3uTools resolves it. If the error persists, verify iOS signing status and try iTunes – if iTunes also fails, the device likely has a logic board USB controller fault. 3utools error unable to restore idevice75 link