Creating UEFI USB stick for update Crucial MX300 firmware on Mac – updated to M0CR060

When you replace CD/DVD with SSD and want to update firmware of yours SSD, but can neither burn ISO, downloaded from official website, nor boot from this CD..
Even you have created from ISO boot usb stick – Mac does not see when pressing Alt while booting – it needs UEFI boot loader.

Prepare USB Drive:
Connect yours  pendrive.
Open terminal window.
Determine which device it use in system. In Linux it will be sdX , in OSX – diskN

df -h 
/dev/sdX1 1,4G 1,4G 0 100% /media/user/Transcend8G

then unmount ( do not eject! ) usb drive

sudo umount /dev/sdX1

Download UEFI usb stick image with Crucial MX300 Firmware updater M0CR060

(UEFI usb stick image with Crucial Firmware updater M0CR050 from  16 May 2017 )

Write image to yours USB drive
Caution! Be careful!
1. You should write to drive (sdX/diskN), not to partition (sdX1,diskNs0)
2. If you specify wrong device – you WILL destroy your OS or data!

sudo dd if=uefi-mx300-M0CR060-usb-boot.raw of=/dev/sdX bs=8K

Now you can mount it back.

Check for latest Crucial SSD firmware at
If it have new version – download it , unpack, open downloaded fimware ISO and replace
/boot and /cde folders on USB drive.

Your UEFI USB Drive is ready to use.
Boot your mac with Alt key pressed and choose UEFIBOOT drive.
You will see two menu options:

* Micro Core Linux with waitusb=10 and superuser
* Micron Storage Director  FW update

Choose second one for FW update – and relax.

8 thoughts on “Creating UEFI USB stick for update Crucial MX300 firmware on Mac – updated to M0CR060

  1. Release Crucial M0CR060 for MX300.
    downlod M0CR060 from and from the following thread download.

    Format USB with MSDOS/MBR
    Extract and copy it to USB with EFI folder
    Extract M0CR060 and copy it to USB with boot and cde folders
    Extract and overwrite grub.cfg over USB on /EFI/boot
    Restart from USB, select the second from the top of the menu and wait for a while
    Success is displayed and it will be successful if it restarts.

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