I successfully applied 10.14.6 Supplemental Update 2 to my HackbookPro 6,2 by doing the following:
- Backup (I use Carbon Copy)
- Create a Mojave Installer USB using Dosdude Mojave Patcher version 1.33 (if you don't have one already)
- Install Supplemental Update 2 (System Preferences > Software Update)
- Allow system to reboot and follow prompts to complete installation
- Reboot from the Mojave Installer USB
- Run Post Install Utility
- Select only the Legacy Graphics Patch
- Reboot
- From terminal, run 'sudo kextcache -i /'
- Reboot
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