The “failed to verify code signature” error in AltStore typically occurs due to issues with the app’s code signing identity or a mismatch in system time between devices.
It is a common error while attempting to install AltStore or IPA files on iOS devices.
🔍 What it Means (Error in Context)
Here are some specifics based on community reports:
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The error often looks like:
Failed to verify code signature of /private/var/.../AltStore.app : 0xe8008018 (the identity used to sign the executable is no longer valid.)or similar. -
Another common variant:
0xe8008015, meaning “A valid provisioning profile for this executable was not found.” -
These errors usually mean that Apple’s system doesn’t trust the signing identity (certificate) used to build/sign the app, or that a required provisioning profile is missing/invalid.
🛠️ Possible Fixes
Here are steps that people have used to get around this issue. Not all fixes work in all situations, so you may need to try more than one.
| Fix | What to Do |
|---|---|
| Update AltStore & AltServer | Ensure you are using the latest versions. Sometimes older builds have expired certificates or bugs. |
| Re‑install via AltServer | Connect your device via USB (or via same WiFi if supported), open AltServer on your computer, then choose to install AltStore onto your device. This reinstalls the app with a fresh certificate. |
| Check provisioning profile | The provisioning profile must match the bundle identifier and be valid. If your app’s provisioning profile is expired or has wrong identifiers, you’ll get signature verification failure. |
| Ensure date/time settings are correct | Make sure your device and your PC/Mac (running AltServer) have the correct date & time. If they are out of sync, the signature or certificate may appear invalid. Community reports often mention that fixing date/time helped. |
| Remove old versions before installing | If an older version of the app is present (maybe already “expired” or partially removed), uninstall it fully before installing a fresh one. Sometimes leftover files conflict. |
| Use a compatible iOS version | Sometimes updates in iOS break compatibility (or increase signature checks). If you’re on a beta, recent major version, or an unsupported version, the newer iOS might enforce stricter signature rules. |
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Troubleshooting Steps
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Ensure date and time are in sync on both devices.
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Use the latest AltStore and AltServer versions.
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Trust the developer certificate on your iOS device.
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Restart your iOS device, the computer, iTunes, and iCloud.
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If still unresolved, consult the official Troubleshooting Guide or reach out to AltStore support.
These steps resolve the majority of “failed to verify code signature” issues encountered when using AltStore.
