Hello,
after unpacking I immideately changed the default OS to SwOS but the switch did not boot up.
So i went back to RouterOS (using Reset Button) and ran /system/swos/upgrade to upgrade to the latest SwOS.
version: 2.17
status: ERROR: file not found
was the response.
So my question: Does a SwOS for this device already exist or not?
Check this page
https://mikrotik.com/download
Can’t see CRS310 being mentioned there.
I don’t see on the product pages any mentioning of SWOS either so why should it be able to run swos ?
Even more conclusive: product page doesn’t mention SwOS at all.
Only a handful of CRS devices actually support dual boot and product pages of those do mention both OSes as supported. One example is CRS326-24G-2S+IN.
Okay, looks like it is my fault.
But what irritates me is the presence of SwOS settings inside RouterOS and the possibility to activate SwOS booting…
There you have a valid point.
Best to contact support about it.
Either an error in config, or SWOS might be coming (someday/maybe).
IIRC initial design goal was to support dual-OS on all CRS3xx devices. It seems MT gave up on this quite early into introduction of devices from this family, so it’s likely that your CRS won’t see SwOS support. But as @holvoetn suggested, you better ask support@miktotik about that.
It seems that SWOS is now available for this model, i don’t know how to install it however. If anyone knows how to install, please tell me 
Go to Upgrade tab.
Then hit the button “Download and upgrade”, I would say ?
Well, no. I think it must be installed somehow.
According to https://help.mikrotik.com/docs/display/ROS/CRS3xx%2C+CRS5xx%2C+CCR2116%2C+CCR2216+switch+chip+features#CRS3xx,CRS5xx,CCR2116,CCR2216switchchipfeatures-ConfiguringSwOSusingRouterOS using /system swos upgrade should upgrade the primary backup version of SwOS, and you then install the secondary main version having booted into SwOS and using the Upgrade menu.
As this doesn’t appear to work in your case you could try https://help.mikrotik.com/docs/pages/viewpage.action?pageId=76415036#CRS3xxandCSS32624G2S+seriesManual-ResetandReinstall and if that still doesn’t work I would suggest contacting Mikrotik support - their servers may be misconfigured and not offering the the file requested.
Hmm there is some problem here, now i have RouterOS 7.12.2 and then via System/RouterBoard/Settings i can select BootOS:
Router or SwOS.
after this step switch looks dead … no link, only recovery way is Reset pin 5 sec and power ON. Then RouterOS is going back.
any fix or solutions? guide how to switch to SwOS?
Update to the latest RouterOS, then follow the steps below:
# Update the firmware after routerOS upgrade:
system routerboard upgrade
# Reboot the device to apply the firmware update.
system reboot
# Install the SwOS on the CRS310:
system swos upgrade
# Set the SwOS as default boot:
system routerboard settings set boot-os=swos
#reboot again
system reboot
This doesn’t work:
[admin@MikroTik] > /system routerboard settings set boot-os=swos
failure: not allowed by device-mode
how do you change device-mode?
See https://help.mikrotik.com/docs/spaces/ROS/pages/93749258/Device-mode. The routerboard settings are disabled in all three modes, you have to explicitly enable it.