Your firmware is out of date, suggesting 6.49.10 longterm is the better firmware (safe and stable) for V6: https://mikrotik.com/download/archive#show02132aaa0fd6c93975be12c3ea119165a9270d93_0100
Ensure you choose the correct one for your model.MIPSBE
The other alternative is a two step process, to 7.12 and then to 7.13.3 if you want to use version 7 firmware.
One of the main advantages of vers7 is the ability to use wireguard vpn natively. If that’s not a concern than nothing wrong with 6.4.9.10
https://mikrotik.com/download
7.12.2 - https://mikrotik.com/download/archive#show44d6a93909892b6b0fc6c09a6bc927ef5e8cbde5_0100
For Vlans on the router read through: http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1