Hello.
Maybe someone will reply here, 'cause support@mikrotik.com is keeping silence...
1. Broadcom GigE on-board LAN is not working since 3.2. On 3.1 everything is fine.
2. As i know, the ROS license (Software ID) is fixed to a HDD when you first install ROS.
I've tried to move my HDD to another server with Intel NICs instead of Broadcom, but it started with another SoftwareID and said that I have no license.

BTW, the problem was not with Broadcom NICs, but with BIOS settings:
Advanced -> USB Control
USB - Device 29, Function 7: disable

This is something abount USB 2.0 Functionality and RHEL.
Setting it to "disable" help to boot ROS.
Strange, but ROS <=3.1 worked fine even with these settings.

thanks for taking the time to update us.