Admin password to access router

[Luvridge]

The 2 questions I am asked are not the ones I set up originally to access router. Default password won't work either. Will reset of router cause issues for reconnection?

[CrimpOn]

If the router is configured with exactly the same WiFi SSID/password as before, then devices will reconnect automatically.

(Just personally) I find configuring the router with the web interface more reliable than using the Orbi 'app'.

[plemans]

Reset shouldn't cause any issues. I reset pretty frequently for testing things. 

Like @CrimpOn says, just use the same ssid/password and devices should auto-connect without issues.