In order to change expert password of Check Point firewall running GAiA OS, logon to CLI, make sure you are in “clish” mode and execute command “set expert-password plain“. You need to enter current expert password and they you’ll be able to choose a new expert password.
set expert-password plain
CP-Firewall-GAiA> set expert-password plain
Enter current expert password :
Enter new expert password:
Enter new expert password (again):