Finish the migration and restart the system Discard a message pop up for Time Machine version warning Install Monterey 12.4 and use Migration Assistant using Time Machine backup Erase the drive and create APFS blank drive with disk utility Start your Mac from Monterey 12.4 based USB installerį. ![]() Create OpenCore EFI based Monterey 12.4 full installer on an USB stickĭ. Create a full Time Machine backup to an external driveī. ) Just in case you need to roll back Monterey 12.5 or 12.51 to Monterey 12.4Ī. (If you would like to download the above full package, please copy paste the above link in a new tab. As you can no longer download 12.5 Beta or 12.5 Beta2 from Apple, you’d better stay with 12.4 while you can still download the full installer from Apple if your Mac has Nvidia GPU. ![]() Interestingly, Time Machine Backup for both 12.5 and 12.51 restore succeeds if you use 12.5 Bata fresh install + Migration Assistance. Noone has reported this on Macrumors Forum macOS 12 Monterey on Unsupported Macs Thread as yet. It goes into start up loop and user folder creation fatally fails. ) But after 12.5 or 12.51 update on my unsupported iMac 27 inch late 2013, try to restore full from Time Machine backup using fresh install 12.5 or 12.51 + Migration Assistant fails when my iMac restarts at the end. Monterey 12.51 running on unsupported iMac Both macOS Monterey 12.5 and 12.51 update work on unsupported Macs with Nvidia GPU acceleration. OpenCore Legacy Patcher Team released version 0.4.10 fixing Macs with Nvidia Kepler issues. For more details, please visit the following Macrumors Forum macOS 12 Monterey on Unsupported Macs Thread Update: 20/08/22 Recommendation for an unsupported Mac computer with Nvidia Graphic Card should stay with Monterey version 12.4. The latest Monterey 12.5 public release updates the system, but once OpenCore Legacy Patcher applies root patch then restart the system, it goes into login loop and the Mac computer becomes unusable. Warning!!! ( This has been solved by OpenCore Legacy Patcher 0.5.1) Starting from macOS Monterey 12.5 Beta 3 update, Apple has taken away Graphic Card Acceleration support for Nvidia GPU known as Nvidia Kepler (Like my iMac 27 inch 2013 with Nvidia GeForce GTX 780M 4GB – iMac 14.2). OpenCore Legacy Patcher 0.5.1 Update Ventura Support+ Monterey 12.6.1 & Big Sur 11.7.1 How to updateĪs to macOS Ventura, please refer to my other Blog post. Please refer to the following Youtube link (by very talented Mac specialist Mr. Monterey 12.61 running on unsupported iMac Link for macOS 12.63 full installer package is as follows But when I tried the latest 12.63 release on the installation USB 3 disk combination of OpenCore Legacy Patcher 0.61, Monterey update was successful. For whatever the reason, I could not update macOS Monterey 12.61 to 12.62 as 12.61 installed external 1TB SSD said “downgrade volume not possible”. OpenCore Legacy Patcher Team released ver 0.6.1 recently. I will wait until the public release of Monterey 12.4 to get to version 12.5. ![]() However, I’ve decided not to apply any Beta updates as I’m using Monterey with my unsupported iMac on my main production Mac and taking the Automatic Update option off. The end result for my macOS Monterey unsupported iMac 27 inch late 2013 is the following images.īeing involved with the Apple Developer Program, my iMac 27 inch late 2013 also showed the Monterey Developer update before the public Beta test. It covers the latest macOS Big Sur 11.6.7.Īpple Myth 13 – How to install macOS Big Sur (11.2) on unsupported Mac devices (After starting up Mojave, Big Sur and Monterey by swapping the startup disk and each time I reconnected iCloud, my Apple ID password was disabled for a security reason – according to Apple) I had to reset the password while going through a tedious process not mentioning I had to change the Apple ID password for all the other Apple devices including my iPhone and iPad).Īs to a genius BenSova’s Patched Sur, please refer to my previous blog post link below. Please also note that Apple does not like a Mac computer having multiple profiles (one machine starts up from different macOS), so please do not connect to iCloud except for the macOS you use for your main production environment. Also, I do not want to install unsupported macOS on the internal disk of my iMac 27 inch late 2013. ![]() The reason I use an external USB connected SSD disk is that I need multiple macOS environments to test various issues my clients are having. Please note, this does not cover all unsupported Mac devices. This blog post is based on upgrading an external SSD installed on my Big Sur disk (using Patched Sur on my unsupported iMac 27 inch late 2013 – iMac 14.2) to macOS Monterey.
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