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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