You should be able to factory reset the WF500 device as well. Did you try to interrupt the boot sequence to go to maint mode?
Just curious about how you are sure that WF500 doesn't have maint mode, since we have tested it.
Not sure if this will help but you can clear the system/config logs on disk by,
> clear log <tab>
config Configuration logs
system System logs
The WF-500 Appliance has somewhat similar OS command line structure and boot menu as other Palo Alto devices. Thus, there would be a 'main' option upon boot up.
These steps would help with resetting the device to factory settings :
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