This is a critical question. The legacy.html page is widely considered safe by the jailbreak community (r/jailbreak, iPhoneDevWiki), but with caveats.
| Error Message | Why It Happens | Fix | | :--- | :--- | :--- | | "Untrusted App Developer" | You forgot to trust the certificate in Settings. | Go to Settings > General > Profiles & Device Management > Trust. | | "Unable to Verify App" | Apple revoked the certificate for that specific URL. | The maintainers must re-sign the app. Wait 24-48 hours or change your device's date back to the certificate's issue date. | | White Screen on Safari | Your iOS version is too old for even the legacy page. | Clear Safari cache. If that fails, you must use a computer-based tool (3uTools or AltStore). | | App Crashes on Open | The jailbreak is incompatible with your exact iOS sub-version. | Double-check compatibility. Phoenix works on 9.3.5, not 9.0.2. | jailbreaks.app legacy.html
If you see jailbreaks.app legacy.html , treat it as a historical document. For actually jailbreaking a modern device, look elsewhere. For breathing life into an iPhone 4 on iOS 6? That page is your Rosetta Stone. This is a critical question