CUPS support in chirpstack

Can some one clarify that the Basic Station support in ChirpStack Gateway has only the Websocket connection and there is not CUPS endpoint.
Is there a way to support CUPS in chirpstack gateway bridge? if not then how the Firmware update does happen with the Gateway?

The ChirpStack Gateway Bridge only implements the LNS protocol, not the CUPS protocol. Note that these can be two different things. E.g. a gateway vendor could host a CUPS server for remote management of the gateway, including the configuration of the LNS endpoint.