We recently bought a couple of FortiExtenders at work, and I initially had a hard time figuring out how to set a password for the default admin account. Turns out the only way to do so is through the FortiExtender's web interface. The FortiExtender CLI has some superficial similarities to that of a FortiGate, but unlike on a FortiGate there is no way to set or change the admin password through the FortiExtender's CLI (at least not that I could find).
So Fortinet: please add at least at least a single sentence about this in your official documentation for the FortiExtender. I wasted a lot of time trying to figure this out.
