Problems connecting my RBS10

Hello

I bought six month ago a Orbi AC1200, with a RBR10 and two RBS10.

I set up the RBR10 as an access point, because there were network disks already connected to my main router.

The problems came when I decided to try and connect the satellites :

1. Out of the box, one satellite is just blinking red. I can't do anything with it. The manual says that the firmware is corrupted, but doesn't give any solution to solve that...
2. The second satellite connects. Backhaul is described as good. But no devide can connect on it. Basically, as soon as I enter the perimeter of this satellite, my devices disconnect from the wifi network (iphone, ipad, dell laptop,...). I try to change the settings as described in a number of posts on this forum; nothing works.

my current config

If there is any idea, I am all ears.

Thanks a lot, 

Olivier.