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.
||Open the Linux Terminal window.
||Connect the Linux USB port to the ASA.
||Enter the following commands to find the Linux USB port number:
root@usb-suse# cd /dev
root@usb-suse /dev# ls -ltr *ACM*
crw-r--r-- 1 root root 188, 0 Jan 14 18:02 ttyACM0
||Connect to the USB port with the following command followed by the ASA USB port speed
root@usb-suse /dev# screen /dev/ttyACM0 9600
||To disconnect the Linux USB console from the Terminal window, enter Ctrl-a followed by : then quit.