When I login to admin the modem/router (which is no problem) as soon as I select Settings (5th tab) I am taken to the password screen
When I attempt to select any of the options from the sub-menu (L/H side tabs) I get a dialog box which says "
"Unsaved Changes Please apply or cancel your changes before you proceed further"
No matter whether I save or ignore I am always returned to the password screen and the same prompt appears when I try to exit the screen.
The only way to get out of this loop is to close the browser window so I am unable to access any of the features in the configurartion - USB, Print Server etc...
All browsers exhibit this problem: Chrome, Firefox, Opera, Edge, Brave, Vivaldi...
Sounds like you need to factory reset it. Press and hold the reset pinhole button until all the lights go out.
The config looks to be confused.