Recover lost hscroot password for an IBM HMC or any unencrypted boot drive

removed hard drive from HMC and used a sata usb adapter to connect it to an Ubuntu virtual machine

mounted /dev/sdb2 to /mnt/sdb2 and /dev/sdb3 /mnt/sdb2/var

chroot /mnt/sdb2

/usr/bin/passwd hscroot

replaced hard drive into hmc and booted - now able to logon with my new password!