MikroTik

Hello everyone I did backup from another mikrotik that is different then this new device. I forgot to change settings and all I did was binary backup and did not change anything the backup loaded successfully but now the problem is with the password. I used every password I can use even the password and username from the other router is not working I tried using netinstall but still the configurations remain same even when i had unchecked the box keep the old configuration. Does someone know how to tackle this problem?
Thanks