How to Check If an iOS Version Is Still Signed

The fastest reliable way to check whether Apple is still signing a specific iOS build is to attempt a restore in Finder (on Mac) or the Apple Devices app (on Windows) with the IPSW file for that build. If Apple has stopped signing it, the restore fails immediately with the message “This iPhone software is not currently signed by Apple and cannot be installed” — before any data on the device is touched. Community-run signing tracker websites can give you a fast approximate answer, but their status is not authoritative until you confirm it against Apple’s servers yourself.

Why signing status matters before you try

Every iOS install and restore goes through an authorization check with Apple’s signing server. If the build you’re trying to install is no longer signed, the process fails — no matter which computer, cable, or IPSW file you use. This affects two situations most:

• Downgrading from a newer iOS version to an older one
• Restoring a device to an older build for testing, troubleshooting, or matching a company deployment

For a detailed explanation of what signing is and why Apple closes signing windows, see what IPSW signing means and why Apple stops signing firmware.

Two ways to check, compared

There is no official Apple-published dashboard for signing status. Apple neither announces when signing windows open or close, nor provides a public API to query. That is why the two options above are the only reliable paths for a non-developer user.

Method 1 — Attempt a restore in Finder or Apple Devices

This is the authoritative check because it uses the exact same signing verification Apple applies to a real install. If the build is unsigned, you see the failure before any data on your iPhone or iPad changes.

On Mac (Finder)

1. Download the IPSW file for your specific device model. On an iPhone 17 (iPhone18,3) that means the iPhone18,3 build, not a generic iPhone file — the wrong identifier fails with a different error.
2. Back up your device first if it still boots — Apple’s backup guide covers iCloud and computer backups.
3. Connect your device to your Mac and open Finder.
4. Select the device in the sidebar.
5. Hold Option and click Check for Update. Select the downloaded IPSW file.
6. Watch what happens next:
7. If Finder starts the update, the build is signed.
8. If you see “This iPhone software is not currently signed by Apple and cannot be installed”, the build is unsigned. Cancel out — nothing has been written to the device.

For a proper restore (not update), the same steps apply with Restore iPhone instead of Check for Update. Note that Restore erases the device, so back up first regardless.

On Windows (Apple Devices app or iTunes)

1. Download the correct IPSW for your device.
2. Open the Apple Devices app (or iTunes on older Windows systems).
3. Connect your device and select it.
4. Hold Shift and click Check for Update (or Restore iPhone).
5. Select the IPSW file. The same signed / not-signed message will appear.

If a different numbered error appears instead — 3194, 4013, and so on — see the iTunes and Finder restore error code index for what that specific code means. Error 3194 in particular is often confused with an unsigned-firmware error but usually has a different cause — see how to fix error 3194.

Method 2 — Check a community-run signing tracker

Several independent websites monitor Apple’s signing server continuously and publish signed / unsigned status for each iOS build. This gets you an answer in seconds and is useful for quick planning — for example, deciding whether it’s still worth attempting a downgrade this week.

Two important caveats:

1. Third-party trackers are observational, not authoritative. Apple can close a signing window without notice at any hour. A tracker showing “signed” 30 minutes ago does not guarantee the build is still signed right now. Always confirm with Method 1 before making decisions with data consequences.
2. Some tracker sites overlap with the jailbreak community. Their signing data is accurate, but the surrounding recommendations sometimes involve tools that fall outside Apple’s terms of service. Treat trackers as read-only reference sources for signing status only.

We do not link to specific external tracker sites here — search for “iOS signing status” to find current ones — because their availability and accuracy vary over time.

What the two “not signed” outcomes actually mean

If you get the “not currently signed” message during a restore attempt, one of two things is true:

• The build was signed briefly and Apple has since closed the window. This is the most common case. There is no way to install this specific build now through Finder or Apple Devices, regardless of technique.
• The build was never signed for your specific device model. This happens when a build was released for other models but not yours — for example, a build only distributed to Apple engineers, or an IPSW mismatched to the wrong identifier.

Either way, the practical answer is the same: pick a build that is currently signed for your device, or accept the current iOS version.

When this won’t work

Some situations where these checks either can’t help or don’t produce a clean answer:

• You want to know when a signing window will close. No one knows. Apple does not publish this and does not follow a predictable schedule. Signing windows can last days or weeks after a new release; nothing about elapsed time reliably predicts closure.
• You want to check signing status without downloading the IPSW. Method 1 requires the actual file. If bandwidth is limited, Method 2 is your only option — with the accuracy caveat above.
• Your device is stuck in DFU or recovery mode and can’t complete any operation. Signing status is not what you’re troubleshooting in that situation — see the DFU mode guide for entering and exiting those states cleanly.
• You’re on a corporate or school network that blocks Apple’s signing-server ports. Method 1 can appear to fail for network reasons rather than signing reasons. Test on a different network before concluding the build is unsigned.
• You have saved SHSH2 blobs and want to know if they’re still usable. SHSH2 usage is a separate topic with different constraints; see downgrading iOS without losing data for context on when saved blobs can help.

Frequently asked questions

Does Apple publish a signing status page?

No. There is no official Apple resource that lists which iOS builds are currently signed. Apple neither announces when signing windows open or close nor provides a public API to check. This is why the check has to happen either by attempting a real restore or by consulting third-party observation sites.

Can I check signing status without a computer?

Not reliably. You can look up a third-party tracker site on any device with a browser, but the authoritative check requires attempting a restore in Finder or Apple Devices on a computer connected to your iPhone or iPad.

If a build is signed for one iPhone, is it signed for all iPhones?

Not necessarily. Apple signs builds per-device-model. It is possible for a build to be signed for one model and closed for another, though most commonly signing windows close for all supported models around the same time.

How long does a signing window typically stay open?

Usually days to a few weeks after the next iOS release ships, though Apple provides no guarantees or published timeline. If you need to downgrade or restore an older build, act as soon as you know the target build is signed.

Does the check touch or erase my data?

Method 1 does not modify or erase your device until you confirm the actual update or restore. Cancelling out at the “not signed” message leaves your device untouched. Method 2 involves only a web browser and touches nothing on your device.

What’s the difference between “signed” for OTA updates vs IPSW restores?

Apple can independently close signing for OTA (over-the-air) delivery and IPSW-based restores. The IPSW method described here is the more common path for manual installs. If you’re comparing update methods, see IPSW vs OTA update for the trade-offs.

Is there any way to install an unsigned build?

Not through Finder, the Apple Devices app, or iTunes. The only exception involves saved SHSH2 authorization tickets from when the build was signed, combined with third-party tools — an area that quickly moves beyond a general audience and is not covered here.

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.