Last verified: {{VERIFY: DD Month 2026}}
Errors 1110 and 1100 both point to a signing or authorization rejection during the restore — your device asked Apple to authorize the firmware and either the request was refused or a resource needed for the check couldn’t be found. Confirming you’re restoring the current signed version resolves this for most people.
Before you start
- Back up first if the device is still accessible. Use Apple’s official backup guide.
- Turn off Find My before retrying.
- Confirm the firmware is currently signed — see what IPSW signing means.
What errors 1110 and 1100 mean
Both codes relate to the authorization step of a restore on iPhone — 1100-series errors generally indicate the device couldn’t complete the SHSH authorization exchange with Apple’s servers, most often because the target build is no longer signed or the request was interrupted.
What causes it
- Attempting to restore or downgrade to a build Apple no longer signs
- A network interruption during the signing-server exchange
- An outdated Finder, Apple Devices, or iTunes version
- A corrupted or incomplete IPSW download
Fix in order of likelihood
- Confirm the build is currently signed before retrying — this resolves the majority of 1110/1100 cases.
- Update Finder, Apple Devices, or iTunes to the latest version.
- Check your internet connection is stable and retry on a reliable network.
- Re-download the IPSW file in case of a corrupted download.
- Try a different network if a firewall might be blocking Apple’s signing servers.
If it still doesn’t work
- You’re specifically trying to downgrade to an old version. If the signing window has closed, this error is expected and won’t resolve without a saved SHSH2 blob — see SHSH2 blobs explained.
- The build should be current but the error persists. Try re-downloading the IPSW and retrying on a different network.
- A different error code appears on retry. Check the full restore error code index.
Frequently asked questions
What’s the difference between error 1110 and 1100?
Both are in the same 1100-series family related to the restore’s authorization step, and share the same underlying causes and fixes — primarily signing status and network reliability.
Can I bypass errors 1110/1100 to downgrade?
Only if you have a saved SHSH2 blob for that exact device and build from while it was still signed, and even then it requires tools beyond Finder or iTunes.
Does a slow internet connection cause this error?
Yes, an unstable connection during the signing-server exchange can trigger it, alongside the more common cause of the build no longer being signed.
Does this affect iPad the same way?
Yes — the same causes and fixes apply to iPad restores.
This site is not affiliated with, endorsed by, or sponsored by Apple Inc. All firmware download links resolve to Apple’s official servers — we do not host, mirror, or distribute firmware files.
