Updating early 2015 MacBook to Mojave

My old MacBook (early 2015) is running os 10.10.5 however I want to update it but there are no updates available on the App Store. Research shows my MacBook can update to 10.14 but how do I?


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MacBook, OS X 10.10

Posted on Feb 3, 2025 1:30 PM

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Posted on Feb 3, 2025 1:32 PM

Back up your data, check the application compatibility table, click here, and then on the download link for a newer OS.


Catalina and above won't run 32-bit software and split the functions of iTunes up; if you choose one of them, use Go64 as well.


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10 replies

Feb 4, 2025 8:58 AM in response to Lucy__16

Lucy__16 wrote:

the next problem is the MacBook isn’t letting me log into my iCloud (this old MacBook is new for me so setting it up), ....

So does that mean I’m stuck with no hope? I can’t update the OS as I’d need to login into iCloud to download it but can’t login to iCloud because the OS I’m running isn’t high enough?

No, it likely means the previous owner did not properly prepare the laptop for sale by using the steps in the following Apple article:

What to do before you sell, give away, trade in, or recycle your Mac - Apple Support


You will need to start at Step #6 where you must erase the whole physical SSD (Intel Macs Only).


If you want Mojave instead of Big Sur, then you will need to create a bootable macOS USB installer now while you can still boot this Mac, otherwise you will need access to another Mac or first install macOS 10.11 through Internet Recovery Mode using Command + Option + Shift + R, then upgrade to just Mojave.


If you don't specifically need Mojave and want Big Sur, then try booting into Internet Recovery Mode using Command + Option + R. Creating a bootable macOS USB installer is still a good idea so you have more options available in case Internet Recovery has any issues.


Keep in mind in order to downgrade the OS requires erasing the whole SSD which destroys all data on the SSD. If the seller did not do the steps in properly preparing the Mac for sale, then this is something you should do/have done to ensure there are no nasty surprises left by the previous owner. Even if the previous owner did all that, then I still recommend the new owner perform Step #6+ anyway.


Feb 4, 2025 11:16 AM in response to Lucy__16

You don't need to sign into iCloud to download the Sierra installer. That one is distributed as a .DMG. (It's the most recent one that is – from High Sierra on up, you need to be able to access the App Store.)


Back up your Mac.


Download the .DMG to your Mac (which may require the aid of a modern Mac or PC, if Yosemite is not able to handle the https security on the Apple Support site). Open (mount) the disk image. Run the installer inside. Once you're on Sierra, use the App Store link in the Support article to upgrade the rest of the way.


NOTE: If the old owner did not prepare the Mac properly for resale, you might also face challenges related to that. But if the issue is simply that Yosemite is too old to access the App Store any more, the two step upgrade (Yosemite => Sierra => Mojave) might do the trick.

Feb 3, 2025 4:00 PM in response to Lucy__16

Note that you can upgrade a MacBook (Retina, 12-inch, Early 2015) to Big Sur, but no further.


Catalina and Big Sur break 32-bit applications, but would let you run current versions of

Neither is among the "most recent three" that vendors like Microsoft and Adobe support. If you currently have the Pages, Numbers, and Keynote applications, be sure not to delete your only copies of them – as the ones that Apple currently offers in the App Store require Sonoma or higher.


Sierra, High Sierra, and Mojave are enough to run Firefox 115 ESR.

Mozilla Support – Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release

That's an older version of Firefox that stopped getting new features some time ago, and for which "critical security updates" might stop as of some time next month.


I have seen mention of a project called "Firefox Dynasty", which is apparently an attempt by some people to take the code for current versions of Firefox, and port it back to older versions of macOS. I am not familiar with that project.

Feb 4, 2025 4:51 AM in response to Niel

Thank you, the next problem is the MacBook isn’t letting me log into my iCloud (this old MacBook is new for me so setting it up), It either says the password is wrong which is not true as I’ve set a new password and it’ll work on my phone but not the MacBook, or if I try log into messages or FaceTime it will give my phone the 6 digit code to log in which I add to the end of my password but it says there is an error in activation or something like that.

Feb 4, 2025 7:34 AM in response to Lucy__16

System requirements for iCloud - Apple Support


"To use iCloud you need at least iOS 10 on iPhone 5, iPod touch (6th generation), iPad (4th generation) or iPad mini 2; watchOS 3 on an Apple Watch; macOS Sierra 10.12 on a Mac; tvOS 4 on an Apple TV (4th generation); or visionOS 1 on an Apple Vision Pro."


That may be an issue. I believe that Lion was the current version of Mac OS X when Apple first released iCloud, so they must have raised the minimum requirements for iCloud once or twice. Now Yosemite, the version of OS X you are running right now, is no longer supported.

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Updating early 2015 MacBook to Mojave

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