Two methods:
Interrupt boot sequence, and type /bsd at boot prompt. Then select rd0a from the next menu. Then you will get a root prompt, mount wd0a (flash) and change etc.A_xxxxxx directyory name to sth, unmount and exit. You will get the default config with root password Ascend change password, mount wd0a again rename directory to original name, and unmount, do a grwrite -v. I do not know if there is an official solution but this works.
Or you could try...
1) First, you must be attached to the GRF via the console port. It is not possible to telnet into the unit to recover the root password.
2) Then boot the unit in single mode. During the boot sequence you will see
the following line:
pci0 at root: configuration mechanism 1
Start hitting control-c at this point. Messages will being scrolling by very rapidly until a line appears that asks which shell you would like.
Hit return.
3) Mount the internal flash drive.
#mount -w /dev/wd0a /flash
4) Change the master.passwd file in the flash directory
#cd /flash
#cd /etc.A_X_X_X,default (Where A_X_X_X is your current sw version)
#vi master.passwd
the following line will appear:
root:Jf83vkLw3.w9:0:0::0:0:System Administrator:/root:/bin/ksh
^^^^^^^^^^^^remove this
The line below shows what you want it to look like:
root::0:0::0:0:System Administrator:/root:/bin/ksh
5) Update the database so the change is accepted.
#pwd_mkdb -d master.passwd
6) Unmount the flash drive
#umount /flash
7) #reboot
