Late 2015 retina 5K iMac recovery mode not working correctly.

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Level 1

4 points

Late 2015 retina 5K iMac recovery mode not working correctly.

I recently got a late 2015 Retina 5K iMac and Used open core legacy patcher to get the most recent operating system running on it. At this time, I also wanted to have windows using Boot Camp at the same time but an error occurred saying it couldn't partition my disc and I've already checked disk utility and Used first aid to see what's wrong with my fusion drive and it said there was an corruption within the drive that can be fixed in recovery mode, but whenever I reboot my computer and hold command, R it just boots into Internet recovery and completely flashes my entire fusion drive. Is there a way to fix this?

iMac 27″, macOS 15.5

Posted on May 28, 2025 7:17 PM

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Answer 1

Top-ranking reply

HWTech

Level 9

68,198 points

May 29, 2025 9:14 AM in response to Flare-svx

There have been a number of people on this forum who had problems reverting back to an officially support OS. I highly recommend you create a bootable macOS USB installer for a version of macOS is actually compatible with that Mac by Apple....assuming you can boot this Mac normally. This will give you another option in case Internet Recovery Mode (Command + Option + R) gives you problems.

Create a bootable installer for macOS - Apple Support

You will likely need to perform a PRAM Reset to clear the custom PRAM/NVRAM settings that are required for the OCLP hack since they appear to prevent the booting of actual supported versions of macOS. Hold the PRAM Reset for three chimes if possible.

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Answer 2

rkaufmann87

Level 10

148,422 points

May 28, 2025 9:31 PM in response to Flare-svx

Yup! Hopefully when you bought the 2015 it was setup by the previous owner per the directions in What to do before you sell, give away, or trade in your Mac. If it was not the computer will always be associated with the previous owner. Yes, even if you wipe Mac OS off and start over.

Also, it would be to your benefit to read the Terms of Use of these forums, you can find the link at the bottom of this web page or click Legal - Website Terms of Use - Apple

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Answer 3

rkaufmann87

Level 10

148,422 points

May 28, 2025 8:48 PM in response to Flare-svx

We can’t help as you have installed an illegal (heavily hacked) version of Mac OS. This violates the terms of use you agreed to. Basically you got a boat anchor.

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