http://www.crucial.com/usa/en/support-ssd?cm_re=us-support-_-main-_-firmware-update-link
Firmware M3CR022 has been tested and qualified for immediate release in the Crucial factory, including 2.5-inch and M.2 models of the MX500 SSD. The update from M3CR010 to M3CR022 is an optional update for SSDs in the field, but is recommended if the MX500 is experiencing any of the following issues:
Improved ready time from DEVSLP low-power state.
Improved TRIM and Wear Leveling performance.
Improved SATA error handing.
Improved compatibility with some TCG Opal 2.0 third-party encryption utilities (this change does not affect MS BitLocker).