: This means the enterprise certificate is currently revoked by Apple. You will need to wait for a new certificate or use a PC with a tool like Sideloadly
Jailbreaking your device can void its warranty and may cause instability or security issues. Proceed at your own risk.
: It allows for immediate re-jailbreaking if the device reboots, which is critical for "semi-untethered" jailbreaks common in later iOS versions. Verified Tools for iOS 12.5.7
: "No-PC" apps use enterprise certificates that Apple frequently disables (revokes). If the app stops opening, you will need to find a new download link or use a computer to sideload the app.