The software version of the Galaxy M21 is M215FXXU2ATJ5, which comes with the October 2020 security patch. While the Galaxy M31 is getting this update with build number M315FXXU2ATJ9 with the October 2020 security patch.
According to the changelog, it comes with some improvements in the camera department. The latest update is currently rolling out in India. You can check the complete changelog below:
– Split Keyboard is supported on Landscape mode.
– The search function of the “Manage Input Languages” screen in the Keyboard Settings page has been newly updated to make it easy to find keyboard input languages that the user wishes to add or delete.
– A feature has been added that allows the user to send SOS location-sharing messages every 30 minutes for 24 hours.
– Improved the quality and stability of the camera.
The security of your device has been improved.
To check for the update manually on your device go to settings > Software Update > then tap on Download and install.