In this case the files installed under EFI/boot come from grubefiusb-0.03.zip The following files should be installed on the USB: use a suitable volume name - in this case we use: EFIBOOT Imageįcbe41548463ce929f140367edbd23af423553de EFI/boot/grub.cfgįollow the general instructions as per the original post for the M550. use Partition Map type: Master Boot Record. To format the USB flash drive, insert the USB in the Mac.įormat the USB drive as FAT32 (MS-DOS in OS X Disk Utility). Please note: using GRUB to boot the Micron firmware updater is unsupported. The same EFI Boot method can also be used to boot MicroCore linux or some other small linux system. The original GRUB-EFI files can be downloaded from the Gparted project on sourceforge if preferred. Tin圜ore and MicroCore linux can be found here: ĥ. The downloaded version used for the GRUB-EFI files was: gparted-live-0.20.0-2-amd64.zip Ĥ. Crucial SSD firmware downloads can be found here: Previous Crucial/Micron firmware updates for the M4 and M500 SSDs used a FreeDOS based update that could not be booted from a pure EFI/UEFI environment.Ģ. More info on the M550 MU02 firmware update can be found in M550 MU02 thread on the crucial support forums. You will need to use a generic USB keyboard. The Micro Core Linux option can be used for troubleshooting, but the macbook pro keyboard and some other Mac keyboards might not work. The M550 FW update option will update the firmware with no need for user input. If no key is pressed, the default menu option is used. * Micro Core Linux with waitusb=10 and superuser When the GRUB bootloader runs, the GRUB menu can be seen and the user can then select the preferred boot option using the up/down arrow keys. In a few seconds, Startup Manager appears and you can select the EFI Boot USB device. When restarting a Mac, press and hold the Option key at boot time. In Linux we can use the Gparted application to change the partition flags. There might be some EFI/UEFI implementations where this is required. This is an optional step and should not be needed in most cases where the USB uses an msdos partition table. Set the boot flag for the FAT32 partition (optional step). In practice, the following files are needed on the USB: The files provided in the cde folder of the Crucial/Micro download, do not appear to be used in the M550 MU02 update, but there is no harm in having them on the USB. The EFIBOOT volume should now contain the following folders: Now copy those folders and files to the root of the EFIBOOT USB. Open the M550 firmware ISO where there will be two folders: Install the Crucial / Micron firmware update folders to the USB. The EFI folder and files should be copied to the root of the USB flash drive. To install the EFI bootloader, open the folder containing GRUB-EFI files: Once formatting is complete, the volume should be mounted as EFIBOOT.
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