Fortigate

Technical Tip: FortiGate initial configuration 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-FortiGate-initial-configuration/ta-p/283529

Technical Tip: How to reset to Factory Default configuration using external button 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-reset-to-Factory-Default-configuration/ta-p/198660