Hello. We recently bought CCR1009-7G-1C-1S+ to replace dead CCR1016-12G. We had 6.16 OS on ccr1016-12g (yeah, very old, but current config didn't work on any newer version).
I had decide to downgrade CCR1009 to 6.16 via packages - downgrade (at this moment I didn't know that it is unsupported version for this model). After this router booted normally, but I couldn't connect to it via WinBox, not by IP, not by MAC. Nothing showed in Neighbours, mo matter what port I connect to. On router screen i saw that interface status is link-ok.
So I decided to upgrade to current long-term 6.48.6 via Netinstall. Router successfully upgraded (I've checked version via screen), but I still cant connect to router. In Netinstall I've tried default configuration, manual IP, IP via configure script - same problem, no ping to router IP, cant connect via IP or MAC, nothing in Neighbours, web interface does not open. I even tried to add different IP address via screen - same result. Also checked on another PC