I understand that both the main router and satellite are not working. I suggest you to check the internet access on the primary modem through a hardwired connection. If the modem has internet access, I suggest uninstalling the SBC application and resetting both the main router and satellite. After reset relaunch the SBC app and start over the setup process. Also, make sure that the satellite is completely powered off while setting up the main router.
If the problem persists, after trying the above steps, you can visit www.arris.com/consumersupport for more information. Warranty inquiries are handled by Consumer Support.