Im in the progress to update the lab so I started by updating to latest RouterOS 7.19beta8.
That went smoothly. First download the binary (npk) for the correct CPU arch over at https://mikrotik.com/download and login to the CRS326 switch using webfig and upload the file to the Files (menu option to the left).
Then reboot the device and unless /system/routerboard is configured to autoupgrade you will need to perform a /system/routerboard/upgrade (through webfig or terminal) and then issue another reboot.
So far so good…
But how do I update the installed SWOS if the switch have no internetconnectivity?
Because if you go /system/swos/upgrade that will try to phonehome and fetch the binary over the internet which wont work in my case.
But since latest SWOS (2.17 as of writing) is available as a binary over at https://mikrotik.com/download I assume there is some method to update the SWOS without first having to reboot into SWOS - or am I missing something here?