Factory reset 500D

Hello

Please refer to the document related to 500D

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-To-Reset-To-Factory-Default-Configuration/ta-p/198660

https://www.avfirewalls.com/datasheets/FortiGate/FortiGate-500D.pdf 

If the proper solution doesn't work (press the button after resetting the unit, in the first minute after Status button started blinking slowly), then you need to find that console cable. You will probably need it to reinstall a newer FortiOS anyway if this is a new unit to you. 

Hi kazzax,
Hope you are doing good.
You can factory reset the box using below:
https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-reset-a-FortiGate-with-the-default-factory/ta-p/196896

Regards,
Parteek