Hi @JoDongWook ,
If everything is ok and the check passes, the appliance generates a System log (Monitor > System Log) of informational severity and boots successfully. If the check detects a software corruption or possible device tampering, starting with 8.1.3, the appliance boots in to maintenance mode and you must contact Palo Alto Networks Customer Support for assistance. We’ll help you to learn more about what caused the check to fail.
As per this DOC:
PAN-OS 8.1.1 Software Integrity Check – What Happens When a Device Fails this Check?
... View more