Messed up Bootmgr on a Nokia IP350

I have a Nokia IP350 firewall appliance running IPSO 3.7. I have to upgrade this to Nokia IPSO 4.2.
I have started the process by accessing the bootmgr after a reboot. I issued the "install" command and it has prompted me for a password. All personnel that might have known the password have moved. I found several solutions which suggested removing the hard drive, doing a dd copy of the nkipflash.bin file and the result is now the bootmgr has been hosed. At the current time, the bootmge prompt does appear but only after I receive the following on the console:

/dev/wd0f on /mnt: Incorrect super block
Error: /image on /dev/wd0f
does not exist or is not a file
umount: /mnt: not currently mounted
boot failed

Any help would be appreciated.