When you replace the motherboard in the server, you must install a fallback miniroot image on the new SP that corresponds to the version of Oracle Solaris that you are using. The miniroot image is not part of the OS or firmware image that you install on the server. You must also update the miniroot image when you install a new version of Oracle Solaris on the server, so the fallback image matches that version and SRU of Oracle Solaris.
Errors will occur if the fallback miniroot is missing from the SP or if the version does not match the OS installed on the server. For example, if the miniroot is missing, output from the Oracle ILOM show faulty command will include defect.ilom.fs.miniroot-missing.
You must download the fallback miniroot image for your hardware and your Oracle Solaris version from My Oracle Support at https://support.oracle.com. Then follow the procedure "How to Update the Fallback Image" in Booting and Shutting Down Oracle Solaris 11.3 Systems.
See additional information about use of the fallback miniroot on the SPM in "Uploading a New Solaris Miniroot Package From SP to Host" in Oracle ILOM Administrator's Guide for Configuration and Maintenance.