@stephenw10
Yes, thanks for that, downloading the config file and examining it , I saw my old pwd described under "gold encryption password" as well my newly created one .
Did another manual auto config backup , made a minor change to one of the comments on a VLAN then did a full restore to its previous state - all fine .
I honestly had no appreciation before that literally everything is present in that config file - unhashed passwords, digital certificates etc, not a thing to leave lying around !