KNOT modem firmware update

It appeared under a PPP interface using the NB/CAT-M modem the message
“Anewer version of modem firmware is available!”

Does anyone knows how to update it?

Actual ROS version 7.15

In the Interfaces menu at the modem.
modem_upgrade.png

Thanks for the answer, but the Knot has not a LTE interface.
It is a NB/CAT-M that is completely different from a LTE.
The Upgrade Firmware button is not present…
modem.jpg

There are commands in terminal, see:
http://forum.mikrotik.com/t/ppp-client-firmware-upgrade/175063/1
but I would ask official support before attempting using them, as there may be a definite procedure (like disabling the interface or not before attempting the upgrade) to follow.