VAC-5000HD Userās Guide337.2.20 [F90] Displaying firmware versionYou can display the firmware version.7.2.21 [F91] Displaying hardware versionYou can display the hardware version.7.2.22 [F99] Setting maintenance/status display menuSetting valuesoFF: Not display[Default]on: Display (at the next start-up: OFF)ALL: Always display (at the next start-up: ON)