: Indicates a "universal" image that includes all Cisco IOS software features, including strong payload cryptography (standard for modern ISRs).
to previous releases once a newer version (like 15.9.x) has been installed, as it may impair router functionality or cause boot errors. Security Changes c800universalk9mzspa1583m9bin work
Known caveats? Memory/Flash requirements? (We have 1GB flash / 512MB DRAM). : Indicates a "universal" image that includes all