Hello FRANK,
The error message you are seeing from HP Firmware Runtime Intrusion Detection indicates that the system has detected an attempt to modify or disable firmware protection mechanisms. While the PC continues to boot normally after pressing Enter, the repeated error codes (30 and 520) suggest that the firmware protection is being triggered consistently.
Since a system restore did not resolve the issue, I recommend checking for the latest BIOS/firmware updates from HP for your ProDesk 600 G6, as these updates often address runtime detection alerts. It is also advisable to uninstall or disable any third-party repair or optimization tools temporarily, as they may interfere with firmware-level protections. If the error persists, performing a clean installation of Windows 11 could help rule out software conflicts, but the underlying firmware alert should still be investigated.
For a definitive resolution, I suggest contacting HP enterprise support with the specific error codes and log details, as they can confirm whether this is a false positive or a genuine firmware protection event.
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QQ.