WARNING: The firmware update process is done entirely at your own
risk. Before initiating the update process be sure to backup or make copies of
all important files. If the firmware process is interrupted your solid-state
drive may not function properly.
UEFI-based Systems: During validation of this firmware update we
noticed instances where our update tools do not recognize the SSD with some
systems using UEFI. The target device is not recognized as an updateable device
during the reboot process. If this happens, the firmware update will not occur,
and you’ll retain the firmware version you started with. Windows will then
restart normally. If this sequence occurs, you cannot upgrade to this firmware
version at this time, but you’ve done no harm to your system (or your data).
If you have a Dual Boot system we recommend using the Manual Boot Process as
opposed to the Windows Update Utility.
If you have more than one m4 in your system, note that the Windows Update
Utility will update all eligible drives automatically. With the Manual Boot File
you will be prompted on which drive(s) you want to update.
If you have questions or need assistance, please contact our Technical
Firmware for the Crucial m4 mSATA SSD is being updated from version 01MH to
The m4 is updatable to this new firmware starting from any previous version
in a single step.
Do NOT use any other m4 firmware update for your m4 mSATA SSD such as
the 040H firmware for the 2.5” form factor.
Firmware for the m4 SSD is being updated from version 04MH to 07MH.
Firmware 07MH is recommended for anyone currently running 04MH or
previous firmware releases. It includes incremental improvements and
refinements over these versions which may improve the overall user
Like recent firmware versions, version 07MH has improvements over
versions 000F which are specific for Windows 8 and new UltraBook systems,
although systems running Windows 7 and other operating systems may also see
improvements. Any m4 firmware version will function normally in Windows 8,
even without these performance improvements.
The following is a summary of changes between 04MH and 07MH, which are
independent of operating system:
Resolved a power-up timing issue that could result in a drive hang,
resulting in an inability to communicate with the host computer. The
hang condition would typically occur during power-up or resume from
Sleep or Hibernate. Most often, a new power cycle will clear the
condition and allow normal operations to continue. The failure mode has
only been observed in factory test. The failure mode is believed to have
been contained to the factory. This fix is being implemented for all new
builds, for all form factors, as a precautionary measure. The fix may be
implemented in the field, as desired, to prevent occurrence of this
boot-time failure. To date, no known field returns have been shown to be
related to this issue. A failure of this type would typically be
recoverable by a system reset.