Installing Monterey

Question

Installing Monterey

I have tried to install Monterey the regular way, from an external hard drive, in safe mode and pretty much any way I can think of with no luck.

My computer is the following:

MacBook Pro (Retina, 13-inch, Early 2015)

I have installed extra memory myself, so it is 8 GB and I have plenty of free space.

I think it might have to do with me doing freelance work for Microsoft on the computer and therefore having given permissions to them, but I had no problems installing the previous update.

Any advice?

MacBook Pro 13″, macOS 11.6

Posted on Dec 7, 2021 8:31 AM

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Answer 1

Top-ranking reply

lllaass

Level 10

210,459 points

Dec 7, 2021 9:29 AM in response to LingerLongLund

Do you have an Apple SSD installed? If it is a third-party SSD the install will terminate with that message. This is message I received when my third-party SSD was installed.

Other possible problems:

Do you have enough free disk space?

If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44GB of available storage.

Do you have an antivirus or cleaning apps installed? If so remove them using the apps uninstall instructions

Try deleting the existing Monterey installer that is in the Applications folder. Then boot to Safe Mode and redownload the installer and try the installing again. The boot to Safe Mode takes minutes.

How to use safe mode on your Mac - Apple Support

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Answer 2

lllaass

Level 10

210,459 points

Dec 7, 2021 10:07 AM in response to LingerLongLund

The only way foud so far is to install internally an Apple SSD, upgrade/install Monterey on it and then put back the third-party SSD and upgrade to Monterey. The Apple SSD is only required to update the Mac's firmware. After that a third-party SSD upgrades fine.

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Answer 3

Dec 7, 2021 9:00 AM in response to lllaass

Thanks for your answer. I just checked and I have SSD installed. The error message comes after download when I try to start installing the program and it says (translating from Norwegian here) "An error occurred when preparing to install. Please try to run the app again."

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Answer 4

PRP_53

Level 10

91,765 points

Dec 7, 2021 9:35 AM in response to LingerLongLund

Agree with previous posting - there have been frequent persons reporting the same issue as your.

There are reports appearing on the ASC Forums regarding failed installation of Monterey on older Qualifying Apple Computers. In most cases this is related to having a NON Apple Original internal drive ?

The EFI Boot ROM included in Monterey is verifying for Original Apple Drive and if not found , may Balk or fail to upgrade to Monterey.

Reports indicate the EFI BOOT ROM is Required to Flash the Computer and is a requirement for a Successful Monterey Installation.

Possible solution, is to flip out the After Market Drive and replace with Original SSD. Run the UpGrade to Monterey and then flip out the Original SSD for the After Market SSD and run the installer again.

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Answer 5

Dec 7, 2021 9:41 AM in response to lllaass

Thank you! That so helpful of you. I have a third-party-SSD, so that might be the problem, but then there is really not much to do, is there?

I have 400 GB free on the hard drive on the computer, so that should be enough.

It might be some cleaning apps installed when I started freelancing for Microsoft, I have removed the antivirus app, but the last time I ran into trouble with them it took hours to remove them as they were hiding strange places...

I have also tried deleting and re-downloading and installing in safe mode.

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Answer 6

lllaass

Level 10

210,459 points

Dec 7, 2021 8:53 AM in response to LingerLongLund

What exactly happens when you try to upgrade?

Error messages?

Do you have an Apple SSD installed? One is needed for the upgrade since the upgrade includes updating the Mac's firmware.

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Answer 7

Dec 7, 2021 9:44 AM in response to PRP_53

Thanks! That possible solution of yours is smart one! I might accept that my computer is stuck in Big Sur though.

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Answer 8

Dec 7, 2021 10:11 AM in response to lllaass

Thanks! I will sleep on whether I want to do that or not for this upgrade. Really appreciate it.

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Answer 9

PRP_53

Level 10

91,765 points

Dec 7, 2021 10:34 AM in response to LingerLongLund

The suggestion of @ lllaass was really the source, on this ASC Forum IMHO, to hit upon the possible solution. Flip and flip again just so the EFI Boot ROM would flash the computer.

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Installing Monterey

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