unixusb
I want to create a live USB to run a Linux derivation and followed these guides:
Make and create Live USB Linux for Mac? How?
Making a Bootable USB Stick on an Apple Mac OS X from an ISO
Everything just went fine following the tutorial, but when I restart my MacBook Pro I cannot choose the USB drive, it just doesn't show up.
Open Disk Utility (you can find it in the Utilities folder). Insert your USB drive, and select it in the left pane. Choose the tab "Restore" on the right side of the window, drag the image file into the "Source" field and the USB drive into the "Destination" field. Click the "Restore" button.
That should do it.
I can confirm that this process works:
https://fuerstnet.de/en/upgrade-crucial-m4-ssd-firmware-mac-without-cd
There are many steps to follow, both in creating the usb disk, then in booting from it, but it took me to the firmware updater as promised. After all that effort, my disk was already up-to-date, but it did work.
Crucial support says there is no option for people without a CD drive, but there is. You just have to be willing to carefully follow some instructions and be sure you're not writing to the wrong disk.
Best Answer
I looked at the second guide and the actual process is much simpler than the method suggested there.
Do the following, it works.
Go to Disk Utility, click on your USB drive on the left pane and click on the Info button at the top. Make a note of the Disk Identifier (Disk0, Disk1 etc.). Then, unmount any mounted partitions on your USB drive, but don't eject the drive itself.
In Terminal type the following, without pressing Enter afterwards...
Then, drag your .ISO file to the Terminal window so its path is entered quickly and easily.
Add the following line onto the end of the command line, altering the number at the end if your USB stick's Disk Identifier is other than Disk1
You should end up with a command like this...
Hit enter, put your password in and wait for the magic to happen. It will take a few minutes and there won't be a progress bar so be patient.