Firmware update for XMG3512-B10A

Hi:

I saw a recent security bulletin that some vulnerabilities have been identified in some Zyxel products.

Is there a firmware update for XMG3512-B10A? When I search that model here: https://www.zyxel.com/global/en/support/download?model=xmg3512-b10a , it's not found.

Also, when I logon to my XMG3512, the Maintenance menu does not have the File Manager menu item so I don't see how to update the firmware. How to?

Thank you!

Bob H.