Boot from that Linux OS, then choose the second "default" option from the boot loader menu. rEFInd should be able to find a Linux OS on the internal HD. Note that this does a byte-to-byte copy, so using a small USB drive if you can to save time. dd if=/dev/rdisk2s1 of=/dev/rdisk1s1 bs=4m. Use dd to copy the bootable USB drive to the internal HD, e.g.Erase the internal HD with Master Boot Record and FAT32 file system.This USB drive contains both syslinux and Crucial's firmware (which I think is in boot2880.img) Use UNetBootIn to create a bootable USB drive from Crucial's firmware updating ISO.The main problem was that iMac refused to boot from an external USB drive, even using rEFInd. The iMac does have its original internal HD, which turns to be crucial for solving the problem. I was trying to upgrade firmware for a Crucial m4 256G SSD on a mid-2012 27" iMac. Not sure if you have resolved the issue, but I'll explain how I did it here in case it's useful for other people. But how do I know if that DMG is up-to-date, reliable, and trustworthy? Even if it is, that route seems unnecessarily complicated. One part recommends using rEFIt-Syslinux.dmg_.zip. I've also read Updating firmware on Macs without a superdrive too. I tried two different sticks to reduce the chances that it was a hardware issue. The steps seemed to work, but the resulting USB stick would not boot. I've have waded through a muck of articles about how to copy an ISO to a bootable USB stick, but I have not found a solution that works and that I'm comfortable trying.įor example, I read How do I burn an ISO on a USB drive on Mac OS X? and followed the steps. To fix the problem, I did the following: Uninstalled Storage Executive. (As of this writing, the latest is Crucial_m4_040H-04-00.zip.) I did a restart, still running Storage Executive v6, and the Momentum Cache tab then said that Momentum Cache was inactive. If necessary, I will reluctantly use a commercial tool. I hope that means using only built-in Mac software, such as Disk Utility and Terminal for commands. I want to start with the Crucial SSD Firmware Update and copy the ISO to a bootable Mac USB stick, using a minimal set of tools.
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