@digitalsawdust Welcome to the Rockstor community.
Yes this is a bug in our latest iso (3.9.1 as of writing) where we accidentally have a “3.0” which should be “3”. The work around is fiddly but easy.
Please see the Note: section at the end of Step 7 of theMirroring Rockstor OS using Linux Raid howto as the rescue system is also required in that howto and has the work around kindly documented by forum member @HBDK. See the following forum thread for the backround:
Yes, assuming you have not created any shares on the system (rockstor_rockstor) pool; the import procedure is at the end of our Reinstalling Rockstor in the Data Import sub section. You might also want to take a look at the Restoring Configuration subsection that follows directly on from the Data Import one. Only useful if you have also saved and downloaded a config backup before hand of course; please see the Configuration Backup and Restore doc section, it’s linked in the prior Restoring Configuration section but I’ve linked here for convenience. But better / potentially less disruptive to just reset your root pass really as then your existing config is unaffected.
Hope that helps and let us know how you get on.