Uniden BW3451R+1 Owner's Manual page 34

Advanced Settings
Password
Uniden strongly recommends changing the default password to a more
personalised one.
After your device displays on your Device List screen, tap on the icon to access
the Edit Device screen.
Tap on the Advanced Setting option to display the Advanced Setting screen below.
Tap on the Change Password option to key in and confirm the new password.
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