New old router

[Stratoc1]

Hi I used my own TP Link Router for about 8 years until the heat sync fell off.

I got the router Talktalk sent me It's a Sagemcom Fast 5364 and it works a treat.

I just wondered on my account it says we can't recognise your router and firmware?

Is it still supported and do I have latest firmware? Just wondered as I reckoned if you can't recognise it you can't update it.

Like I said works a treat just wondered if there had been security updates in the last, must be 9 years!

TIA 

[Stratoc1]

thanks, can I download it anywhere, that seems to be the only way to do it manually?

is this my firmware? sg4k10001400t 

[KeithFrench]

The current firmware is V206.