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Model A1224 / Mitte 2007 und Anfang 2008 / 2, 2.4, oder 2.66 GHz Core 2 Duo Prozessor

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Update iMac 2008 to El Capitan, tried everything

Good day

I have a 2008 imac 20in with a working El Capitan. Because i was planning to sell it I re installed the OS, but it's giving my the error installer not recognize, damage etc.

I have tried: change date(wifi off) reset the PRAM, removed the battery and still having the error when installing.

The USB I'm using is working, I setup an iMac prior to this unit and I created another USB just to be sure but still having the error.

Diese Frage beantworten Ich habe das gleiche Problem

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Have you tried using internet recovery?


yep, its not working also


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Ah! You’re hitting the expired certificate issue within the installer. Here’s more on this issue: If you've got an old macOS install image, it will probably stop working today

From this mess Apple did update many of the older OS’s. To get a good version download from here How to get old versions of macOS

I recommend setting up a USB thumb drive as an OS installer, First reformat the drive to GUID Journaled using Disk Utility then follow this guide How to make a bootable OS X 10.11 El Capitan installer drive. Then just boot off of the installer to first fully wipe your drive again use Disk Utility wiping it with a pattern so your data is not recoverable. Then use the the OS installer to install a fresh OS.

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i have done this already.

On the website, How to get old versions of macOS, the file downloaded is a .dmg file, not an .app file.


@jujoe - Double click will unpack it


Yup, after opening the .dmg, it will show the .apk file. Then installation doesn't proceed on my MBP 2019, so i can't extract the .app file.


@jujoe - Ouch! I guess I'm spoiled, setup my refreshed USB installers from a 2011 iMac. Even still there is a way around the certificate issue using your older installer.

You'll need to alter the Data & Time control panel altering the year back in time and disconnect the time server so your alteration is not reset back to todays year before you've completed the OS setup task. Then use your Mid 2007 iMac to setup the OS installer. So you can then properly wipe your system and install a clean OS.


@danj did alter the date and time from 201 to 2016 but still no luck. I used also the release date of El Capitan just to o be sure. Just weird that this is happening now hehe. Thanks mate


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jujoe1 wird auf ewig dankbar sein.

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