Can't use this Fortigate for anything modern. OS can't be upgraded past 5.2.10, when 6.04 is the current code.
Device is old line and should be taken out of circulation. It cannot be upgraded past 5.2.13. 5.4.10 is a more recent version, a little more stable than 5.2.13, but can never be brought to current code 6.0.4. This is a brick and should not be put in a production environment. I misread that this was a 200B and not a 200D which would allow the upgrades. As is, it's worth $20 including delivery, no more.
Not one of Fortinet's finer moments.