Had to replace old Trustgate 160 firewall - and opted for new Cisco ASA 5506X unit compatible with company WAN setup.
Easy enough to get running in simple setup isolating LAN on 7 bridged ports gainst WAN on port 1.
First learning: prior to changing default IP - REMEMBER to add new LAN to approved management networks list! AND the factory reset switch is disabled by default - so for me it took quite a while to connect USB console cable, recalling old CLI knowledge - and get it accessible on GUI again.
I had to use my Linux server for access:
Connect to the Console Port with Linux
Follow these steps to connect a Linux system USB port to the console using the built-in Linux Terminal utility.