Question about Draytek G.fast router Vigor166 Gen2

I am a Wingo customer (Swisscom network) and have been using the modem for years in modem/bridge mode with the g.fast only setting and firmware version 4.2.3_STD. I have not yet tried to update to version 4.2.7_MDM7.

It's in the release notes or manual. But as far as I know it is the one with no.3.
And standard also works.