My 5448 does not support ipv6

I've got three 5448 devices, firmware version 2.0.0.41.  On each one, when I click in the tree Home / System / IP Addressing / IPv6 Interface, it replies

Access Error: Data follows

Form is not defined

 

What do I need to do?

Also, I can't figure out how to enable SSH access.

 

Thanks for any help.