RBS850 out of sync backhaul

Thanks a lot for quick response and much appreciated FURRYe38.

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

HC> Not sure

What is the size of your home? Sq Ft?

HC> 1000 sq feet. 4 rooms with thick concrete walls
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.

HC>Now it is 10 feet. I tried to put it in a number of places within my home but still failed. i.e. backhaul status out of sync and no device can connect except via ethernet directly
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 📡

Try connecting the one RBS to the back of the RBR via ethernet cable and see. Turn off the other working RBS. 

HC>Will try tomorrow.

The ORBI mobile app shows it as "green" but no device connected to it. Again is this new one faulty as i login its admin page but always looping for status update?

Should i try to upgrade the firmware of all ORBI first? but if i cannot access the new one how can i upgrade its firmware?

Thanks again!