I'm still running asa723-k8.bin. I've just copied asa804-k8.bin to an ASA5505 trying to upgrade. My problem is that if I now do a 'wr mem', I get the following.
Cryptochecksum: 42f9323 .....
%Error opening disk0:/~/asa804-k8.bin (Directory doesn't exist)
Error executing command
sh running-config works, but if I do a 'sh startup-config', nothing is printed.