When anyone asks for help, he should tell the people what SW release he's got on the KSU and on the NAM. As far as unplugging the power cord - F915 will most likely shift to F916 and so on, so you'd better do the restart using F915/reboot.
I have seen the "Features gone problem" after upgrading the KSU to higher version incompatible with the older NVM release.
by the way, i am able to restore VM channels from broken hard drives.