Hey

I would like to used 5Ghz channels above 5540Mhz, because I am alllowed to transmit at higher power on those channels.
However, if I enabble DFS, RouterOS ignores my channel selection and set the channel to 5300Mhz.

Is there any (easy) way to make RouterOS prefer 5540Mhz and not just the lowest available channel when DFS is enabled?

You can define the frequencies in the scan-list and then DFS will use those frequencies from the scan-list when looking for available channel.