Before downloading anything, you need to know what you are currently running. Connect via CLI and use the following command: show version This will tell you your current ASA Software Version ASDM Version 2. Where to Download Official software must be sourced from the Cisco Software Central Navigate to:
Since the ASA 5505 is no longer receiving security patches from Cisco, it is highly recommended to use it only for lab testing or behind a more modern security gateway. cisco asa 5505 ios download
Honestly, the ASA 5505 is obsolete. For the same price (or less) than a used 5505, you can buy: Before downloading anything, you need to know what
rommon #1> interface management0/0 rommon #2> address 192.168.1.100 rommon #3> server 192.168.1.50 (Your PC's IP) rommon #4> file asa847-k8.bin rommon #5> gateway 192.168.1.1 rommon #6> set rommon #7> ping 192.168.1.50 (Test connectivity) Honestly, the ASA 5505 is obsolete