About Sonoff ZBDongle-E working with router firmware and ember firmware

My Sonoff Dongle Plus-E has flashed firmware to ember and works fine. Now I want to add a Sonoff Dongle Plus-E dongle as a router in the zigbee network. Should I use the original router firmware or refresh the ember firmware? Note: I didn’t find any information about ember router firmware. Does anyone have any information?

The regular router firmware will do. There is no gain in compiling the router firmware with the latest SDK.

Thank you very much