...

When using a RouterBOARD device, it is always suggested to upgrade its RouterBOOT bootloader after RouterOS is upgraded. To do this, issue the command "/system routerboard upgrade" command in CLI, followed by a reboot. Alternatively, navigate to the GUI System → RouterBOARD menu and click the "Upgrade" button, then reboot the device.

Netinstall

NetInstall is the most commonly used installation tool. It runs on Windows machines or Linux with Wine (superuser permissions are required).

You can download download the NetInstall utility on the https://www.mikrotik.com/download download section.

NetInstall is also used to re-install RouterOS in cases where the previous install failed, became damaged or access passwords were lost.

...