Hi,
Please login to your filer through CLI, and check the prompt how it looks.
For C-dot the prompt will be like this EX : cluster1::>
For 7-mode it will be Ex : fas01>
If it was 7 -mode then type the following command for version.
sysconfig -a
in the output you will find Netapp Release 8.x.x 7-mode.
For C-dot
version
in the output you will find Netapp Release 8.x.x
From that we can find out what the furthur steps that we can take.