MacOS 10.13.6 Update Failed to Complete? Mac Won’t Boot? Troubleshooting Update Failures by ray | Jul 31, 2018 | Mac OS X | 0 comments Try reinstalling from Internet Recovery mode instead: Command + Option + R on boot Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.