To summarize:
- RouterOS v7.x installs ok
- Ports 1-8 negotiate links, leds work as expected, but no L2 or IP traffic flows.
- Ports 9 and 10 work ok and all features are able to use them.
- Through ports 9 and 10, all ROS features I tested work as well as in comparable devices running ROS v7.x
When resetting default configuration the device binds default IP 192.168.88.1 only to ether1. This leaves serial port the only way to regain access to the device and set active IP to ports 9 and/or 10.
As of this writing I've verified this port issue with latest RouterOS v7.4.1 and 7.5rc1.
My ticket number with MikroTik support is SUP-90869