Couldn't upgrade to HS on iMac fusion drive

by vitorzb   Last Updated November 14, 2017 18:12 PM

I downloaded the OS HS from apple store and during installation I got stuck on the following error: "The path /System/Installation/Packages/OSInstall.mpkg appears to be missing or damaged"

I've read a lot but so far haven't been able to solve the problem. I also found out that HS has issues supporting fusion drive.

Info: - iMac 12,1 21.5 mid 2011 - In 2015 I replaced the original HDD with a DIY fusion drive (120GB ssd + 4TB HDD) - using OS 10.12.6 - Sierra - using apple trackpad + bluetooth keyboard - I have a TM Backup but it's months old - I have a bootable usb with El Captain - Don't have access to another mac - Only have a windows laptop but no adm rights (work laptop)

diskutil shows this:

  • disk0 GUID_partition_scheme *120.0 GB disk0s1 EFI EFI 209.7 MB disk0s2 Apple_CoreStorage FUSION 119.2GB disk0s3 Apple_Boot Boot OS X 134.2 MB
  • disk1 GUID_partition_scheme *4.0 TB disk1s1 EFI EFI 209.7 MB disk1s2 Apple_CoreStorage FUSION 4.0 TB disk1s3 Recovery HD 650.0 MB
  • disk2 Apple_HFS Fusion Drive +4.1 TB Logical volume on disk0s2, disk1s2
  • disk3 GUID_partition_scheme +2.1 GB disk3s1 Apple_HFS OS X Base System 2.0GB

My goal is to come back to Sierra, so I can perform a new TM Backup. I understand that since the installation didn't go thru, it shouldn't be that difficult, am I right? **

What I've tried so far:

  1. From the error screen. Utilities > Disk Utility > First Aid on Fusion Drive. The following error appears: "First Aid could not unmount the volume to repair"
  2. From the error screen. Startup Disk > Chose "Fusion Drive macOS, 10.12.6" > Restart. After 15 min beach ball computer restarts and brings me back to the original error
  3. Tried again the attempt 2. but this time after choosing "Fusion Drive macOS, 10.12.6", the following error appears: "building boot caches on boot helper partition failed". I found this, but haven't tried yet (here)
  4. Hard Reset. Reboot holding shift key --> computer restarts and after progress bar comes to 100%, it hangs there until I hard reset it.
  5. Hard Reset. Reboot holding cmd+R combination --> White screen with a crossed circle. diskutil says I have a Recovery HD but it doesn't show up here.
  6. Hard Reset. Reboot holding option+cmd+R combination --> computer restarts and brings me back to same error (macOS could not be installed on your computer. The path system...)
  7. Hard Reset. Reboot holding shift+option+cmd+R combination (internet recovery) --> connect to wi-fi > once the progress bar count down ends I get the following options: restore from TM; Reinstall Mac OS X (lion); Get Help Online; Disk Utility; In Disk Utility:
    • Open Disk Utility > can't mount ssd nor HDD.
    • Open Disk Utility > can't unmount Mac OS X Base System (disk3).
    • Open Disk Utility > ssd > verify disk > "storage system verify or repair failed"
    • Open Disk Utility > hdd > verify disk > "storage system verify or repair failed"
    • Open Terminal > can't unmount Mac OS X Base System (disk3). (diskutil unmountDisk [force])
    • Startup disk > Choose startup disk > no option available
  8. Hard Reset. Reboot holding option key --> two HD icons appear with "mac OS Installer" written as label. I tried choosing both but no luck. After pressing enter, it gets stuck on apple symbol with no progress bar under it.
  9. Also tried Terminal from error screen: can't unmount Mac OS X Base System (disk3)

Any help will be greatly appreciated. Thanks in advance.

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