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Why does my new logic board only accept OS X Yosemite?

My hard drive uses the MacOS Journaled format.

I put in a new logic board and every time I try to install High Sierra from a USB key , the installation goes as planned until it reboots.

The problem is that the computer keeps rebooting indefinitely after a minute or so.

I used internet recovery and it downloaded Yosemite (!).

I guess it’s a matter of firmware, isn’t it?

But it seems the only way to update the firmware is to install High Sierra, which the logic board doesn’t let me do.

Is there a way I can solve this?

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Depending on what you had on your system before as well as how you enabled OS recovery you will get the original OS the system had. Pressing Option & ⌘ and the R keys will get you the highest your system will support

Review this T/N Mac startup key combinations and this T/N How to reinstall macOS from macOS Recovery

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Hi there, thanks for your response. I tried the Option+Command+R but since Sierra was never installed on it, this command doesn't behave the same way.

I still can't boot up, even under Yosemite. It keeps rebooting after a few seconds.

Could it be because there is no battery connected to the logic board?

Or maybe I didn't connect some cable correctly to the logic board?

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Yes, you need to have all the pieces installed and a working battery ;-}

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@danj If the High Sierra install put the APFS format on it, it may not accept a lower system.

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Alex222 wird auf ewig dankbar sein.
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