Orbi RBR 750 issues with Netgear AC1750 cable modem

[Gmurakami]

i recently switched out Spectrum modem with Netgear AC 1750 and have Orbi connected as older cement brick house. Now Orbi speed test won't work and Netgear keeps telling me firmware needs to be upgraded, but I can't access router login site. Considering all devices are netgear I cannot figure out why not working. Considering returning cable modem for Arris modem. Please help with any advice. 

Thanks in advance for any help

[FURRYe38]

Please post about this over in the Orbi AX forum:
https://community.netgear.com/t5/Orbi-AX/bd-p/en-home-orbi-ax

Thank you.

[FURRYe38]

https://community.netgear.com/t5/Orbi-AX/Orbi-RBR-750-issues-with-Netgear-AC1750-cable-modem/td-p/20...