the volume macox is found corrupt and needs to repaired
This is the volume where the OS is installed. It has Mojave. I want to convert it to APFS so that I can install latest OS, but it doesn't allow.
iMac Line (2012 and Later)
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Do you have a backup?
Make sure you do before doing anything.
Try running first aid from within disk utility.
If you have a backup you can probably erase your disk to APFS.