Feedback Thread: Firmware MU02 for M550

Please use this thread to provide any feedback for firmware MU02 for M550.
Firmware revision MU02 for the Crucial M550 (all form factors) is now available. This firmware update applies to the M550 SSD (all form factors), and should not be applied to any other Crucial SSD model.
Visit this page to download the firmware update: http://www.crucial.com/support/firmware.aspx
Release Date: 01/8/2015
Firmware for the M550 (all form factors) is being updated from version MU01 to MU02. The M550 is updateable to this new firmware starting from previous versions using tools provided by Micron.
This update will be mandatory cut-in for new product built in Micron factories, and is an OPTIONAL update for any drive in the field. For end users, it is recommended if the user is experiencing or wishes to prevent an issue related to the following items.
Version MU02 includes the following changes:
Improved stability, Efficiency, and Performance during power state transitions
Improved handling of environments with unstable power supplies
Improved handling of environments with SATA interface signal integrity issues
Improved response time for SMART read commands
Corrected error handling NCQ Trim Commands
Corrected reporting of SMART Attribute 5
Additional details can be found in the firmware guide.

Hejsana wrote:
Hi everybody! Just downloaded MU02 Update, create a bootable CD from the ISO file, tried to boot my MacBook Pro 17" Mid 2010 with the created CD. After loading it automatically started programming... After some time I got the following message: "Firmware Update on /dev/sda failed with status 13... Device Name: /dev/sdaFirmware Update on /dev/sda Failed!CMD_STATUS: Command aborted by the driveSTATUS_CODE: 13Your system will now return to normal operation following a reboot" I thought that the CD is damaged. Took another CD and created another bootable CD. Got the same error. Am I doing something wrong? Thanks in advance for your suggestions...I haven't tried this as I'm using a different model of Macbook Pro and I'm not running a M550. But it seems that Crucial have made a major change from previous firmware updates for M4 and M500 SSDs. In the past they used a SYSLINUX/ISOLINUX bootloader which in turn used memdisk to load a FreeDOS image which contained FreeDOS and the actual firmware updater. This meant that if the CDROM installer didn't work, or the Mac didn't have a CDROM, there were no other options. This method never worked properly for EFI booting from USB in a Mac, although some "hacks" were suggested in forum posts that worked for some people. However it seems that now Crucial are using a different method.If we take a look at /boot/isolinux/isolinux.cfg DEFAULT sd
LABEL sd
KERNEL /boot/vmlinuz
INITRD /boot/core.gz
APPEND quiet base loglevel=3 waitusb=10 superuser rssd-fw-update rssd-fwdir=/opt/firmware rssd-model=M550This means it loads an actual linux kernel - vmlinuz. Now it should be possible to modify isolinux.cfg to change the kernel arguments to work better with the actual Mac hardware or any other hardware that is supported by linux. It should be possible to build a EFI bootable USB updater that loads the same kernel and firmware, but we can modify that with all the correct parameters for the Mac. Unfortunately I don't have the same model Mac or the same SSD, so while I might have a look at making the EFI bootable installer, I can't test the complete firmware update process. 

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