I lately purchased a used MacBook Air 2012 and wished to do a clear set up of the OS.
When restarting from Restoration Mode and erasing the arduous drive, I noticed two arduous drives “Macintosh HD” and “Macintosh HD – Knowledge”.
When attempting to erase the Macintosh HD, there was an error “the amount on disk2s5 could not be unmounted as a result of it’s in use by course of 659 (kextcache) could not unmount disk (-69888) operation failed“.
I wasn’t in a position to boot in Secure Mode. I could not begin in Restoration Mode it defaulted to Web Restoration Mode, at first I had “pkdownload error 2“, erased the drives a couple of extra occasions and bought “Cannot obtain the extra parts wanted to put in Mac OS X” when attempting to put in from Restoration Mode.
I made a decision to make a bootable USB drive from a backup up file “Mac OS X 10.7 Lion Set up DVD.iso“, utilizing a MacBook Professional 2019 and Terminal and the immediate:
diskutil unmountDisk /dev/disk3
sudo dd if="/Volumes/DriveName/10.7-Lion/Mac OS X 10.7 Lion Set up DVD.iso" of=/dev/disk3 bs=1m standing=progress
I adopted these directions to disregard possession on the drive, however now when I attempt to boot from the USB drive, I press Choice, Energy, kind within the Wifi password, and immediately I get a forbidden signal 🚫.
Different issues I attempted:
1-The drives should not defective as a result of Disk Utility First Help returns no errors.
2-I set the right date in Terminal (after getting a sense the interior clock was fallacious)
Is the MacBook Air broken or how can I make the brand new set up?
