The existing network with router, settings and clients is not to be changed. The existing cable-only modem is to be replaced by the ZTE MC888 with 5G/LTE. Can this router be set to bridge mode (passthrough) so that the device can only be used as a modem? If so, does this apply to the 5G/LTE as well as the hybrid WAN? Is there a downloadable manual for this device with a detailed description of the settings? Thank you very much for further information :)