GivInstaller app not operating

I have installed a new router with a new wi-fi setting. I have installed the GivInstaller app, but following the instructions to “Update Wi-Fi Details”, it runs through what to do, but then when it gets to the Update Wi-Fi, the screen returns to the home page again (camera access has been allowed)

All sorted - no explanation as to how but next day it allowed me to access the right set up pages to check dongle and wi-fi ? The only stranger thing now is that it I have access via my phone but second phone will not connect, no matter what I try, even disconecting and reconnecting the dongle ?