In addition, it includes System Utilities to rebuild caches and repair permissions and a. My humble suggestion is to inform the user that no bootloader is selected in this case, instead of the more generic and cryptic error message. I do advanced computations professionally and for 8 years Ive been running a hackintosh as my exclusive work machine. MultiBeast for Mojave is an all-in-one post-installation tool designed to enable boot from hard drive, and install support for Audio, Network, and Graphics. So, in short: Error with 'Mounting EFI failed' in log can be caused by failing to select a bootloader (either via Quick Start or Bootloaders section). So I went back and selected UEFI bootloader, and this time everything worked perfectly.

So I went and checked which bootloader it was installing, and it turns out the configuration file I had loaded into MB didn't have a bootloader selected! I was having a graphics glitch earlier and I think when I saved that configuration file it didn't have a bootloader saved with it. A compatible computer: Not every computer will work with Mac OS X, even with the help of tools like Unibeast and Multibeast. This version is specially designed for macOS Sierra Changelog: MultiBeast 9.2.1 Released NOTE: MultiBeast 9.2.0: Sierra Edition is ONLY for OS X 10.12.x. It also features a collection of drivers and customization options. I went looking in it, and it only had a few folders and one file in it which lead me to think that the error was being caused by MB trying to copy files to a location that didn't exist despite EFI being mounted. MultiBeast for Sierra is an all-in-one post-installation utility designed to enable boot from a hard drive. Exiting.This was a very confusing error because clearly the EFI partition did show up as mounted in Finder. Building a CustoMac Hackintosh: Buyer's Guide

Multibeast logs