How to integrate unleashed R550 with TACACS

[WiFi_GURU]

Hello, 

I have R550 in unleashed mode in the GUI under AAA Servers I am not able to see the option to integrate with my TACACS server. 
My firmware is 200.13.6.1.319 how can I integrate? via CLI or should I upgrade my firmware?

[sanjay_kumar]

Hi @WiFi_GURU 
Currently Unleashed supports only Microsoft Active Directory and the RADIUS authentication options.
TACACS server is not yet supported.