Is my TG582n firmware version current

[#1]

Hi, our HH3 has gone tits up so I had to break out the TG582n. The firmware version doesn't appear to be one I have seen discussed on the forums...
Software Release: 8.C.M.0
Is this a new version or an old one?

[#2]

That's the latest one for fibre.

[#3]

Thanks, it seems to be working ok