To update the firmware on your SSD, follow the steps below. Please ensure you are using an internal SuperDrive® for the update, and that your SSD is internally connected to a SATA port.
When the firmware update has finished, use the power button to shut down and restart your Mac system, and let it boot back up to your desktop.
Below is a video illustrating the process. The video uses an M500, but the process is the same for all Crucial 2.5" SSDs.
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