iM 4,1-14,4 Recovery Mode will not reinstall Monterey in a late 2015 imac 17

[robertgarven]

Dear Friends,



I tried to wipe my late 2015 iMac 17 hard drive and ended up splitting the fusion drive on accident. I secure erased both drives but then Monterey would not install in the internet recovery mode, because there was no start up drive. In recovery mode there is no way to erase and reformat the new Fusion drive to APFS, only extended journaled. I used this link to recreate the fusion drive using terminal How to fix a split Fusion Drive - Apple Support ironically only the second high sierra or earlier commands worked, but the drive ended up being automatically formatted to extended journaled and I don't think Monterey will work or download on that format. I have tried recovery mode OS install several times now with no success. It says an error occurred while preparing the installation. Try again. I tried 10 times now.



Wow this was a perfectly running iMac before I screwed this up. Does anyone have any ideas. I read about every article I could. It seems previously when I upgraded to one of the newerOS systems reformatted one or both of the drives to APFS from Extended Journaled, but internet recovery is not doing that now. I look at trying to convert it using terminal but several tries did not work.



I was hoping to sell this or give it away, but I think I may have ruined it unless any of you have a better idea.



Thanks for any suggestions

Rob

 

[Nguyen Duc Hieu]

You can create a USB installer of Monterey on another Mac, then use it to boot the iMac 2015 and complete the erase/reformat.

 

[robertgarven]

Nguyen,

Thank you. I already looked into that and tried to do it, but my new Mac studio 4 won't allow me to download Monterey and the only other computer I have, is the one that is dead in the water.

 

[Nguyen Duc Hieu]

Nguyen,

Thank you. I already looked into that and tried to do it, but my new Mac studio 4 won't allow me to download Monterey and the only other computer I have, is the one that is dead in the water.

It won't allow you to download directly from Apple store, yes.
It won't allow you to download directly from Apple server?
It won't allow you to download from Archive.org, either?

mac os 12 monterey ISO : Apple : Free Download, Borrow, and Streaming : Internet Archive

heyyyy, ¿que tal?, en un curso que estoy haciendo me han pasado una iso del mac os monterey, debido a que lo estaban instalando via descarga no les iba bien y...

archive.org

 

[DeltaMac]

You can download Monterey using Mist.
(Download the top item in the Assets list, which is a disk image file. Open that to get the Mist App. The App will give you a couple of choices for downloading Monterey, most recent is version 12.7.6 -- which is a good choice to use to then create a bootable USB installer. (Mist, I think, will warn you that the Monterey installer is not compatible... Of course, that is true, but Mist will still allow you to download it, then use it to make your USB installer. All will be good..!

 

[robertgarven]

Thank you all!