Download ASA version 9.12(4.38) and ASDM version 7.16(1) for maximum stability on the ASA 5506-X.
This is the core operating system for the firewall (e.g., asa9-12-4-smp-k8.bin ). Download Software Cisco Asa 5506-x
Cisco ASA 5506-X is a compact, entry-level next-generation firewall (NGFW) designed for small offices and branch locations. While highly regarded for its robust security features, it is important to note that Cisco announced the End-of-Sale Download ASA version 9