RBS50 Satellite Won't sync - even in same room

Hi,

Had to reinstall and reimage the firmware on my router recently after a power brownout.  

The router now seems to be working just fine, but I am unable to get my satellite to sync. 

When I follow the sync procedure I get the puslsing white light for a couple of minutes and then solid magenta (on the satellite)..

I have made sure both the router and satellite have the same firmware image.  (V2.7.1.60)

I've moved the router and satellite witihin 5 feet of each other.  I've tried them in separate rooms.

I've tried factory resetting the satellite.

I've tried setting the SSID of my router back to the same SSID that the satellite appears to boot up with (the factory values from the label on the bottom of the unit)

I've tried using the Orbi app.

I've tried just pressing 'sync buttons' on the router and the satellite,

I've tried logging into the router and using the web interface to initiate a sync.   

All have the same result ... a few minutes of pulsing white then the router goes back to 'no light' and the satellite goes solid magenta.

I remember having lots of trouble getting them to sync the first time I installed the system.  But this seems to be worse. 

Any ideas would be much appreiated!