Macintosh HD-data no Macintosh HD
I have a 2017 iMac which should be compatible with the newest OS. I was previously running Big Sur. My machine completely tanked and I had to use the recovery to reinstall the original OS (Mojave). This worked and machine is running fine, however several of my applications require a newer OS, so in trying to upgrade to Big Sur, I get the "null" and the install crashes. It sent me looking for a fix and I can see in the disk utility that I have a Macintosh HD - Data but no Macintosh HD. I understand with the newer OS (which I had been running) that the HD is partitioned into HD and HD-Data so that the OS lives on it's own drive. I seems like trying to go backwards maybe messed that up?
In utility I also have something called Update. Should I rename that to Macintosh HD and then try OS update? Or should I rename the the Macintosh HD-Data to just Macintosh HD?
Otherwise my machine is working fine, just need to get past this update issue. I have made a complete back up to an external drive.
Any advice would be very appreciated!
iMac 27″ 5K