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:
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to verify code signature of /private/var/.../AltStore.app : 0xe8008018 (the identity used to sign the executable is no longer valid.)or similar.Another common variant: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
Ensure date and time are in sync on both devices.
Use the latest AltStore and AltServer versions.
Trust the developer certificate on your iOS device.
Restart your iOS device, the computer, iTunes, and iCloud.
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.
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