Catalina Supplemental Update Guide
Guide
Credit goes to
u/imtherealshady97 for providing us with this guide on how to install the Catalina Supplemental Update on patched Macs. I'm reposting his instructions with some added details for those who need it. You will need the Catalina Patcher USB, and the CatalinaOTAswufix application, which should be available on the MacRumors forum, which I'll post a link to when I find it.
Note: The build number for this supplemental update is 19H1030 (as of April 26, 2021).
- Open CatalinaOTAswufix app. (If it gives you errors, move the application to your Desktop. Make sure it's the actual application and not an alias. Delete it from your Applications folder once you move it)
- Click on "Software Update Fix"
- After you enter your password, System Preferences will open and begin checking for Software Updates. Click under the cog where it says "Details", and click restore defaults to revert to general public updates. You may need to close the settings pane a couple times for it to take effect.
- When the normal software updates (not beta) show up, click on "Another update is available. It should say "macOS Catalina 10.15.7 Supplemental Update". Click Download and install as if you were doing a normal update.
- Let the update run completely. What will happen is, the computer will seem as if its installing it, but it actually reboots your machine instead. So just let it run through.
- When your machine reboots, open the CatalinaOTAswufix app then click "OTA Update Fix".
- Open System Preferences > Software Update. When the update comes up again, hit "OTA Update Fix" again before you press Install.
- Let the update run through the installation process. Before the installation process is complete, you will need your Catalina Patcher USB.
- When your machine reboots, hold down the Option key. If you haven't already, plug in your Patcher USB, select it and boot to it.
- Click on macOS Post Install. Make sure you select your correct Mac model. Make sure that the "Legacy Platform Compatibility Patch" is selected if its not already.
- Click Patch. Pay attention to it, because when the patch process is complete, make sure you check the box that says "Force Cache Rebuild", then click Reboot.
- Your machine will reboot normally to the login screen. It’s a bit slow at first but it will reboot properly.
- After your machine reboots, make sure to open Patch Updater and check for any patch updates for the system. Install them if necessary. You may or may not get a message saying that some patches (Night Shift Patch, for example) were overwritten by the update. Just simply reinstall them.
- Enjoy.
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I've following the procedure outlined about to update a macpro3,1 from 15H2 to 15H1519
and failing miserably. i've got USBOpenCoreAPFSloader3 installed onto my USB stick.
at what step above should i be booting USBOpenCoreAPFSloader3 (and which option should be
chosen inside USBOpenCoreAPFSloader3)?
i've successful gotten Security Update 2021-007 installed onto my macbookpro8,2 but no success on the macpro3,1