Patched-Sur VS Opencore-Legacy-Patcher

https://github.com/BenSova/Patched-Sur <- You can literally look at the code there also you can look at the code Open Core too. Not its not malware. It links to the other peoples git hubs that helped contribute to the initial project.

Go HERE download the patcher and follow the instructions to the letter. Be aware that you have to be on Catalina to use it.

Maybe it’s worth backup your iMac and check Big Sur patcher, I ran into same problem with reminders, then I installed Big Sur on my 2012 MBP, I didn’t notice any slowdown compared with Catalina and I got remainders working again.

Your data is fine. All source code is available for you see to see on GitHub https://github.com/BenSova/Patched-Sur

Here you go!

You could try to update the system to the latest Big Sur: https://github.com/BenSova/Patched-Sur

Patched Sur

Here's the steps 10..14: https://github.com/BenSova/Patched-Sur

At a guess I would say probably using OCLP - https://github.com/dortania/OpenCore-Legacy-Patcher - lots of life left in old Mac’s using that tool !

I had this issue, too. But luckily, I've got a solution. First, you'll need to check your MacOS Sonoma version. If you're using 14.1 beta, this method will NOT work. In such cases, I recommend installing the official 14.0. Thankfully, this commit (https://github.com/dortania/OpenCore-Legacy-Patcher/commit/1aee2e5dfa12d10e218a51e4151ac2e96705ae9e) solved the problem! However, the latest OCLP 1.0.1 still doesn't have it. To use it, you can build OCLP from code or use the OCLP Nightly link found here. After you find the nightly link and download OCLP, build it onto your MBP, and after rebooting, install the patches. If you look carefully, you'll see that 'experimental T1 Patches' will be available in the list of post-installation patches.

From what I've assessed reading other posts, Monterey (Ventura has USB & stability issues) with OCLP 0.6.7 is the most stable install for this device (have not yet seen any reports using OCLP 1.0+, although happy to see some new non-Metal fixes going in). This is a bit of a bummer, as Monterey will not likely receive updates past end of 2024 (next year).

I'm not taking a position on OCLP being trustworthy or not, but at least the project appears to be 100% open source [0], which is more than we can say about Apple.

[0] https://github.com/dortania/OpenCore-Legacy-Patcher

Have you explored https://github.com/dortania/OpenCore-Legacy-Patcher?

I have used it before and, in my experience and everyone else I know who has used it, the vast majority of time the newer versions run absolutely fine with no issues. Occasionally some newer features don't work, but I'd but confident that 2015/2017 iMacs would be able to run the latest version no problem.

Link to pull request to track OLCP Sonoma support state, you can also read more info there: https://github.com/dortania/OpenCore-Legacy-Patcher/pull/1077