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Opened in recovery mode, was able to delete MacHD-data ok, but when tried to delete Mac HD got following error:
"Preparing to erase APFS Volume content. checking mount state, the volume Macintosh HD on disk2s5 couldn't be unmounted because it is in use by process 646(kextcashe).Couldn't unmount disk: (-69888). Operation failed"
What do I do next?
iMac 21.5", macOS 10.15
If you erased Macintosh HD - Data, you don't have to erase anything else. Macintosh HD contains only the operating system files, none of your data.
If you erased Macintosh HD - Data, you don't have to erase anything else. Macintosh HD contains only the operating system files, none of your data.
Contact AppleCare.
Were you trying that while booted from the Restore Partition?
Do you have an external Drive you can boot from?
Yes to which question?
error while wiping old mac for recycling
