This is the first time for me to replace a faulty Fortigate unit ( in cluster A-A ) with new RMA device.I have some plan of action but am confused between two approaches.
Approach 1 ) Install same firmware as master, sync licences and restore config backup which was taken from faulty device and then attach network cables.
Approach 2) Go as per this document which says that I need to execute this command config system ha and configure some parameters. Once done, attach the new device in network and it will sync the config from primary. https://kb.fortinet.com/kb/documentLink.do?externalID=FD36481
Which of the two is correct or are both wrong and I am missing something else.