When Apple releases a new iOS update, they make it available for download. But they also maintain a real-time . Every time you restore an iPhone via iTunes, the device contacts Apple’s server to check if that specific iOS version is still "signed" (authorized). If it is not signed, the restore fails.
While official tools like iTunes or Finder block these restores to maintain security, a few community-driven tools attempt to bypass these restrictions for advanced users. The Reality of "Unsigned" Restores unsigned ipsw restore tool free
| Tool | Free | A5–A11 | A12–A13 | A14+ | Blobs needed | pwned DFU | |------|------|--------|---------|------|--------------|-----------| | FutureRestore | ✅ | ✅ | ✅ | ❌ | ✅ | ❌ | | iPwnder32 + irecovery | ✅ | ✅ | ❌ | ❌ | ❌ | ✅ | | iRestore | ✅ | ✅ | ✅ | ❌ | Optional | Optional | | iTunes/Finder | ✅ | ❌ | ❌ | ❌ | N/A (only signed) | ❌ | When Apple releases a new iOS update, they
: These typically offer a free trial for entering/exiting recovery mode, but require a paid subscription to perform actual restores or downgrades. If it is not signed, the restore fails
