“USB communication failure during restore – device dropped connection or rejected the firmware signature check.”
| Aspect | Detail | |--------|--------| | | USB communication timeout / root ticket rejection | | Main fix | Manual DFU + USB 2.0 port + Apple cable + 3uTools v2.64+ | | Alternate | Use iTunes directly (if iTunes works, 3uTools is the problem) | | Hardware likelihood | ~20% of cases (Tristar/NAND) | | 3uTools bug | Confirmed in v2.58–2.60 on A12+ devices | 3utools error unable to restore idevice75 link
By trying these solutions, you should be able to resolve the error code 75 issue and successfully restore or update your iDevice using 3utools. 3utools error unable to restore idevice75 link