To recover from a lost Nokia admin password we need to go to bootmanager and boot in single user mode.

Entering bootmgr mode at prompt...when the system boots you will see a message like

Entering autoboot mode.
Type any character to enter command mode

or

Verifying DMI Pool Data ........

1 . . . Bootmgr
2 . . . IPSO

Default: 1
Loading boot manager..1
Bootmgr loaded.


BOOTMGR[0]>boot -s
...
...
...
...
...
...
Enter pathname of shell or RETURN for sh:
# /etc/overpw
This program is used to set a temporary admin password when you have
lost the configured password. You must have booted the machine into
single user mode to run it. The configured password will be changed.
Please change the temporary password as soon as you log on to your
system through voyager.

Please enter password for user admin:
Please re-enter password for confirmation:
Continue? [n] y
...
...
...
...

Admin password changed. You may enter ^D to continue booting.
THIS IS A TEMPORARY PASSWORD CHANGE.
PLEASE USE VOYAGER TO CREATE A PERMENANT PASSWORD FOR THE USER
ADMIN.

Type reboot to restart the device.