RBS850 Satellite Not Detected - Nonstop Blinking White Light

Thanks for the help. I tried the 30/30/30 reset using a timer, yellow LED indicator flashed in the end and went back to pulsing white light. Still couldn't add the satellite to the main RBK853 system. I also tried manually pressing the sync button on the router and on all satellites including the add-on RBS850 that I'm having trouble with. No luck.

As for the FW version, I am now on 4.6.3.16 for the Router + 2 satellites. For the add-on satellite having a problem, I am not sure. So the problem started when I upgraded to 4.6.3.16 for the whole system, 1 router + 2 bundled satellite + 1 add-on satellite. Then when the network was acting up I downgraded all system back to Ver 4.6.3.9 (Satellites first then router). Connected 3 satellites sucessfully but unstable with a lot of connection drops, so I factory reset everything and the system came back up automatically updating to V4.6.3.16 and recognizing the bundled 2 satellites.

I keep referring to the 2 bundled satellites separately as it is already online and has the same default Orbi SSID - Orbi29. The add-on RBS850 that I'm having a problem with has a different default SSID. I figured since it is not factory set as a bundle that's why it wasn't added automatically during the factory reset setup. It needed separate addition into the system but the pulsing white light is stopping the main router from recognizing it. So going back, I am not sure if it stayed in V 4.6.3.9 or was upgraded with the others to V 4.6.3.16. I have a feeling it is still in the former. But I couldn't check as its last known IP address is no longer accessible. I can't access it directly using a LAN cable connecting directly to the satellite and using 192.168.1.1 nor 192.168.1.250 as I have read in other threads. 

I agree with other people that not having access to technical support for product quality issues for an expensive system is an injustice.