New versions of MikroTik RouterOS are being released all the time, and you will need to upgrade your RoouterBoards to make use of new features and bug fixes. To Start off, you will need to go to www.mikrotik.com to download the latest version available.
Once in the downloads section of MikroTik website you will need to choose the version of MikroTik device that you are using, be it a 400, 600, 800 series etc. You may then proceed to download the Combined Package.
Once the file downloaded, we can proceed to copy it to the MikroTik Router. Strart by logging into the router (Make sure you log into the IP address and not the MAC address), and to the Files Interface.
Once the Files window is open, you can drag and drop the upgrade package into this files list, or you can copy and paste the upgrade packages, whichever is easiest for you.
Once the file has finished copying to you router, you simply need to reboot the MikroTik to complete the update. You must however reboot the unit via winbox, as simply unplugging the power and plugging it back in again will not have any effect.