Yes it is safe to install, you don't need to downgrade before going to that firmware. The beta version is being tested and therefore not suitable for public release as of yet. The .66 version is based on 2.0 and not 3.0 so you will lose 3.0 features if you decide to use that firmware instead.
Netduma R1 has been #1
The best gaming router Netduma
And mikrotik .
When I had just received it from UK I first put it on and I was amazed at how it just worked like a beast🤗 and know this awesome new application.
Hope you guys can make knew Netduma r1 or r2 with the high speed bandwith of speed test reaching 1000mbps.that is all it needs.to me it will always be #1
This xr500 is just too buggy.
Great job Netduma team and mikrotik team.